I would not go below 12 AGI if you are going to play battle/strategus at all, but if you're going pure DTV cheese then 9 AGI will be fine.
nah, for strat/(dtv) u can go for max str/3 ath, atleast in tincan times. Get a long maul/spammmberrrrge/pike and u can go on distance. It's not really easy to play it, but it works.
If u go for a EU 1 build and choose to have only 12 agi, the problem is not the combat (hitspeed), the problem is the movement. I always went for 4 riding with that build.