His budget is 14M, but I'm guessing that guy is 21. I personally have never seen much growth on Internationals that are that old. I'm not saying it doesn't happen, but I would not expect him to get close to those ratings.
He's also handed (guessing), which means he will get pounded by righties. His splits are average and his pitches are terrible. If his control ended up mid 80s, he is worthless.
I wouldn't spend any more than $3M, and I would only spend that if my minor league pitching was completely bare and it was the end of the season where someone else better isn't going to come.
With $28M in prospect payroll, I would wait until someone good came along.