what kind of OT do you plan on makin? one that doesnt give sack or one that want to pancake a lot? if you want to pancake get your strenght as high you can, blocking comes in the second most important atributte if its is the case then followed by agility and speed, the rest is as you would like to, if you dont want your OT to give up sacks then you should mainly focus in blocking followed by agility and strength.