To actually help in this thread, since I'm currently done with Underdogs, how you build your MLB will be completely on what arch you decide on. With MLB, you really only have two choices, HH and combo. If you go with HH, I'd suggest going tackling first (either the third or fourth cap), Strength or agility (to either the third or fourth cap then the other) and then circle cap vision and speed to how ever high you want to bring them. You have to take advantage of the .5 gain on majors, so speed will have to be the fourth attribute at the earliest with the HH arch. Going tackling first will give you an advantage early, since you won't miss many tackles early and can start forcing fumbles sooner, and you can make up not capping speed some by pumping all equipment there.
If you go combo LB, I'd go speed-agility-tackling-vision-strength.
As for AEQ, +3 5% make tackle piece is a must have no matter what type of LB you make. If you want to make a HH, a +3 5% FF piece would be a must to go with it. For a HH on SA AEQ, I would either go MH or DG to save sps, or go SV to save BT getting 5 a second extra SA, since head hunter will be the first choice.
For a combo, I'd go SB of DG.
As for zone or man for a MLB, it will depend on what your DC is planning. I've seen a MLB play a lot of zone and I've seen a MLB play a lot of man.
