I consider trophies to be physical for the Science Building, River Docks, and Deputizing costs; and anecdotal for Ma's "Recruit" ability.
As for this whole "Kroen" thing... personally, I think we should all just it completely.
If Kroen returns, even with any other name, then it really doesn't matter as long as he can offer helpful advice or participation and can control himself like he has largely been able to lately. If he becomes a pain then he should not be scolded or provoked. Teach by example, ya know?