It's hard to compare guards to centers. But the thing that stands out to me is that Wagner has double the salary of the other guy. Since big men train so much faster, that tells me that Wagner probably has a lot more TSP.
Defense has a lot to do with rating, so if you look at Wagners OD vs Vanneste's ID, that ought to tell you a lot
If I were you, I'd concentrate on training the 19 year olds. You have 2 MVPs. They won't be great because the 18 year old season is so important. But they can be great for you if you train them right.