This was a good and healthy time.
If he's healthy, he comes up immediately. I'm want him at 3rd full time and I'll get to my reasons shortly. He's a 1-1 talent who is playing well on rehab and showing no effects of the injury. He's a building block of the franchise whether he/we like it or not. Much like Kirilloff, he has the prospect and talent capital that moves him to the front of the line barring injury. He has nothing to prove in the minors and the big club needs the exact help he can give.
I'm not a scout but I have been watching his minor league at bats. He looks comfortable and confident, both at the plate and running. He is taking pitches very calmly, like he is seeing it well. How he adjusts to the big league pitchers adjusting to him is the next question to be answered and that happens in the big leagues.
Now, the word of caution. As mentioned, the 48 games over 4 years means he will have some heavy adjusting to do. He will absolutely have a Miranda period. Do NOT be surprised if he has a 6 week period with .650 or less OPS. Along with freeing up Farmer this is the main reason for setting and forgetting at 3rd base. He needs to be in comfortable positions when possible as we can't have defensive confusion spilling into what are sure to be some offensive struggles. I'm fine hitting him leadoff as long as he's taking good at bats but don't be disappointed if he spends time in the 8/9 hole. Its part of the process. Get him up here and get it started.