He is not a newbie manager, so I think he doesn't need to start with 18 year olds. That is a team strategy for newbies, managers of U21/NT farms or those who want to take a break from ultra-competitive team management and go full rebuild. Sure, like you suggested, if he want to wait 4-5 seasons then hit the restart button and go with six new 18 year olds (in D4). But I suspect he wants to start competing asap, so why not set the starting point little higher? I'd say, if he wants to compete in 2 seasons, instead of starting with 18 year olds 60+ TSP, go for 19 year olds with 70+ TSP but only if he goes with Youth coach (and training facilities). If he don't want to employ youth coach, then why even bother with 18/19, go for 20 year olds at 85ish TSP and MVP+ potential (and that would mean 3 players, not 6). The remainder of the strategy stays the same: keep your team within salary floor, invest in the Arena, but fight to stay in D3.