The problem I am highlighting though is the 200K and 70K guys had they salaries bloat (they are both well-balanced) from the big-men related skills... and over the 3-4 season of training them, I could not add good guards because of this.
guard skills bloat slower, so you could adopt a 3-5 year training plan, but still be competitive, save more money, and then buy cheap big men as fillers closer to the playoffs.
You just wrote out the solution to your own problem. Train all of the guard skills first, with the possible exception of JS, and train the C skills at the end. One he changes his BP to C/PF, all the guard skills (except JS) become free.
by the way, for that 17k guy... "most similar have been selling for around $ 200 000 to $ 250 000".. not the best ROI.
I think we both know he'll sell for much more than that.