Ooohhhh- you're thinking that far ahead.
You know, there's a genre of Fics called "Peggy Sue" fics. In reference to the movie "Peggy Sue Got Married," where characters get to re-do the canon they came from. I have an idea for such a fic, where a character goes back mentally in time to inhabit their younger selves. Mine would be Tetsuro going back and taking the units from Malmot and bonding with one, and holding on to the other two. I like the idea of Cronos not being able to find a single trace of the Units, and trying to imagine how they would proceed.
I have one funny scene imagined where Tetsuro suddenly whirls around at school when he knows Agito is behind him, paranoid that despite how careful he was Agito is still onto him; Agito simply gives him a simple "WTF?!" look.
The twist would be that Archanfel is the one who sent Tetsuro back after the Advents have returned to Earth and decimated it; he sent him because there was simply no one else available to go. It was the deaths of many of the Zoalords and the Rogue Three that splintered the Council, leaving them unprepared for the attack, so Tetsuro has to walk a fine line because he knows as long as the threat of the Advents is still out there, the Twelve are needed. So why do I bring this up in this thread? Easy. He has two spare Units...
That and I like the idea of a Guyver barely using his powers to fight Cronos, using deception and his foreknowledge instead.