Both Kenny and Trevor praise Mikhail as a Badass Grandpa when they see him taking on a horde of zombies while he's got a bullet in his gut. That, and the fact that he dies while fighting Nemesis. Badass Grandpa indeed. And then his Heroic Sacrifice later on.
The final battle with Nemesis ends with Kenny not only blasting Nemesis with the laser, but his rant during the final cutscene:
Ryan from Brain Scratch Commentaries gave Trevor the okay to use his original RAW footage from the Brain Scratch run of Sonic Adventure 2 when Trevor's Gamecube crashed before loading the final levels of the Hero Side Story.