There was a thread awhile back about running combo defenses and the consensus was it wasn't worth it in today's game. I'm doing a limited experiment of primary zone (20 mins practice) and secondary press (5 mins). My guys I started with are now 15 games into their Junior year:
Example 1:
2.8 HS GPA, starting WE of 24 (if it matters), HS FCP
After 74 starts:
B+ Zone, C+ FCP
Example 2:
3,5 HS GPA, starting WE of 62, HS FCP/Zone
After 69 games, 45 starts:
A- Zone, B- FCP
Example 3:
3.3 HS GPA, starting WE of 46, HS FCP/Zone
After 74 starts:
A- Zone, B- FCP
So yeah, he can change his Defense as listed above, BUT I do think it's possible to play combo in today's game without giving up too much potential growth. Of course A- is better than B-, but as an option? Sure. If you limited your recruits to all over 3.5 GPA, possibly even playing your sets in HS by Junior year you can have some flexibility.
Like I said in the other thread though, this is low D1, I make no assumptions about this working at high D1