If you want a brilliant example of a newbie that's learning his way up thanks to getting schooled by vets: Vertex.
What I see from the OP is that he's concentrating on getting the 'decent pubbers' into PUGs (assigning team positions lol). IMO this isn't at all necessary, what should be done is that complete newbloods should be schooled to be decent pubbers. Cos what we want to (or better: what should be) achieved by the helper's team is making the newbie playerbase more 'faithful' thus making the game more popular. Maybe as vet players we feel that L:O is a bit short of people for multiple PUGs, but the ratio of newbies to vets is what needs to be changed.
Take this example of mine, Vertex. Not a llama anymore, slowly learning to be a capper (160 grabs on moonshine w/o RJ), just starting to hit his first MAs, already decent at dodging and not at all bad in rocket groundshots. Schooled a bit by me and a lot by Mariqo. According to OP he deserves a schooling, but by now there's pretty much no way for him to quit Legions. And it's the in the likes of him that we should try getting the newbies to train, not in the likes of vets.
Besides that, great idea. I won't sign up but I lure and school people at legions anyway.