oh... if that's the case, then sure, I wouldn't mind see that concept return... perhaps as consolation for controllers that can't do such a thing, it could use one or two shield buttons for each one respectively. perhaps that way it can leave a little more...ahem, "wiggle room" for the Wiimote in the future, knowing it'll return as a control style.

besides that, I'm recently looking at the final smash and considered what it could perhaps do with other aspects it could effect. perhaps if it ever gets a level 2 or better integration into other aspects, that it could be used up supercharging summon items. on Pokeballs it'll increase the chances of getting a powerful legendary pokemon, but should Assist Trophies be supercharged, it could summon characters exclusive to the summoner's series. for instance, while Shadow is possible for everyone, an assist Trophy from Sonic could unleash Hyper Shadow who rains Chaos Spear on the stage or uses Chaos Blast to deal out greater damage than a smart bomb. I could come up with plenty of examples, like Summoning Omega Ridley for Samus, a flying and tackling caped Baby Mario for Yoshi, an Arwing attack from Team Starfox for Fox and Falco (and likewise for Wolf, though with Star Wolf's Wolfens), and perhaps a generation's set of mascot Legendary Pokemon attacking the stage for the Pokemon series characters.

but besides that, it could really make Summon Items a great deal more strategic if done well.