while i also agree with this, most teams that are new and need mentoring are in div 4 , thus they can train effectively as well as win games. this also sets them up to be contenders in div 3 rather then fodder for other div 3 teams.
div 3 training can get a little harder to manage and keep winning , but is still quite doable as long as you have taken previous steps while in div 4 to make it possible.
ie built a strong economical base for your franchise as well as trained correctly.
this is why i believe for new teams in order of importance should be
1 trainees (the way forward.)
2 arena / assets ( ability to sustain and grow )
3 winning / promotion ( the fruits of your labor)
1+2 are of course geared steps in to making 3 a reality .