Physically strongest would be the pure blood Senju Hashirama. And also, I like how your hiruzen fans only speculate.. and conclude BS like "He knows their jutsus, so he has a answer for them"..
yet he was forced by bunch of mindless Edos who were toying with him to commit a suicide technique?. Sorry, but knowing doesn't mean shit if you can't counter it.
Madara has seen all the Hokages. Hes already confirmed it Hashirama is the only one... And the guy who has seen Hiruzen's prime also confirmed Hashirama is the only one.... And the Anbu just sent Hiruzens hype to hell by saying Second and the first are HAILED as the best shinobi..
When your hiruzen fans stop making speculations and twisting up words and trying to be smart by doing that.. you'll have a real argument .. so far its bs.
But he proves Hashirama hype wise is more stronger.

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Dan sends Sarutobi's hype to hell.. and then Madara just neglects all the hokages besides Hashirama.
And your saying like you know of Hashirama's fighting style.. Sorry but as far as their power level goes shown in the manga Hiruzen is a freaking child.
BOLD part is your assumption.
aware of doesn't mean you can do anything about it.. Tsunade is now aware of PS.. doesn't mean she can do anything about it...
And yea i guess that does make sense in the teaching part. But i think a flashback is required to end that.