@Phantom_Siren652 I would like you to reconsider your point of view on Tengen, sorry for the very long message but it is necessary if I want to argue well because I consider Tengen one of the best
The only real confirmation we have is only Gyomei who is the strongest and if we want Shinobu who is the worst among the hashira, Sanemi is not confirmed as the 2nd strongest but it is a widely shared opinion that at the end of the manga she deserves the 2nd position (but this is also because people like Rengoku or Tengen have not managed to unlock the other power ups otherwise there would have been a difference of opinion on this too)
Speaking of Tengen's strength, I am one who argues that he deserves much more recognition than the fandom associates him with. Starting from the fact that the demon slayer fights are not like in dragon ball, that is, if you beat someone you are not stronger than someone else, since the powers of the demons have different abilities to exploit that can advantage or disadvantage the hashira they are facing: for example, Sanemi proves to be better than Tomioka, but against Akaza Sanemi would be a worse fighter because given his high fighting spirit, it would be easier for Akaza to predict his moves...
The same goes for Gyutaro and Tengen, Tengen was the best hashira that could face Gyutaro since Gyutaro's danger was precisely in his poison which is one of the most lethal in the verse and Tengen had the physique and skills to resist it longer than any other hashira (except Gyomei maybe), if you take for example Obanai or Muichiro they would have died very quickly since their small body would make the poison spread faster and they have no resistance to poisons.
That said it's still impressive that Tengen was able to hold his own against Gyutaro despite being weakened by the poison, Tengen even says that the poison was his main obstacle in the battle since it was draining his strength, he even has to stop his heart to prevent the poison from circulating... now imagine Tengen had he not been nerfed by the poison he would have definitely won without any help considering that without the poison he could use his maximum abilities and could hold his own against or surpass Gyutaro long enough to complete his musical score which is a very devastating ability.
Not to mention all the other physical abilities he has more than the other hashira:
-2 physically stronger
-2 more resistant
-1 faster (in movement)
-2 with more experience
-excellent shinobi skills
-excellent swordsman (also confirmed by Rengoku)
-excellent breathing
-super hearing with which he can echolocate enemies
And he uses a large arsenal including 2 very sturdy swords (which in demon slayer make a big difference), explosive bombs, poisoned kunai
Tengen is a full-blown monster, his only disadvantage was that he met someone who poisoned him and we couldn't observe his abilities at their best. Then I would also like to point out that in the battle against Gyutaro, Zenitsu and Inosuke were fighting against Daki, while Tanjiro was not only a help but also a distraction since Tengen saved him several times, while regarding Hinatsuru, I would like to point out that Tengen used all his kunai to save her (which can be deduced from the fact that he didn't use any in the battle with Gyutaro) and that Hinatsuru only returned the favor by creating a favorable moment.
Finally I would also like to point out that he says that Muichiro, Gyomei and Rengoku have more potential than him because as can be seen from Tengen's speeches he still feels resentment for not always being able to save everyone (a bit like Tomioka who underestimates himself because he didn't believe he deserved to be a hashira) but if we look at his profile this thing is very strange, given that Tengen managed to survive a hellish training that killed most of his brothers and then managed to become an excellent demon slayer until reaching the rank of Hashira which he occupied for many years, I would say that Tengen is not less than the others if we look at his potential.
And I think he too would have been able to kill Gyokko quite easily without a mark considering that Gyokko is not a poison that can weaken Tengen and have better feats with Kokushibo equal or superior to Sanemi given his high experience and strength in terms of combat skills.
I hope I managed to make you change your mind even if a little with Tengen
