Okay, let's say Leon was picked up by the Rays, and is immediately used primarily with 2 starting pitchers.
How many starts would you think it takes for him to get near the level he got with Sale and Price?
I know Price got off to a rough start with the Sox in 2016, but he did end up with much better numbers with Leon by year's end. Chris Sale saw his WHIP improve just about every month of his first year with the Sox.
I'm not saying this is proof of anything, but I think it takes at least a couple months to build a tight relationship.
Yes, some are better than others at building that tightness quickly.