hm, Sho calling a truce makes sense, just confusing why we never saw it. good theory though.
what irks me is how much more powerful Sho is all of a sudden. I mean while Sho was battling Evil Aptom and then having the power ranger city brawl with the Draglord it's not like Agito was kickin' it on a beach somewhere, he was facing off against, outsmarting and then bitchslapping two Zoalords at the same time (three if you wanna count what he did to Balcus at the end).
I get that Sho went all Exceed, but that was a function of plot (to have a giant monster fight) rather than narrative. narrative-wise Sho came out of his fight slightly ahead of where Agito was, having won the battle of wills to summon Gigantic after Hayami's pep talk. so Sho had a willpower advantage, but they were still around a similar level given Agito's smarts, but when they fought it was an absolute beatdown even before Sho whipped out the Exceed.
and for Agito to be so far behind robbed us of what shoulda been a stupendous battle and the climax to Agito's descent-into-villainy arc. I mean I know they were destined to throw-down (the tension has been building since the start of the story) and that Sho would prevail, causing Agito to learn the error of his ways in time to help Sho in the final fight against Chronos (he is Zeus, after all). but I figured that would be a more detailed showdown and an epic battle. Sho didn't even break a sweat!