With Bogaerts, here's what I see:
He hit .289/.369/.453 in AAA in 2013, then came up and played outstanding in the post season (.296/.412/.481), and helped the Sox win a WS.
He came into 2014 and really continued to play well, hitting .296/.389/.427 in his first 54 G.
In game 55, the Red Sox moved him off of SS and to 3B. Coinciding with this was that the pitchers now had an ample amount of data to make adjustments to him. Moving him off SS clearly affected his confidence and he took it to the plate with him. Combine that with pitchers finding some holes to exploit, and it turned into a very bad situation. It compounded on itself, and he never could get his head out of water. Over the next 45 games, he would play 3B in each one, and hit .182/.217/.300.
In Game 99, the Red Sox moved him back to SS. He still had an adjustment period to go through, but with the confidence of knowing that he was the everyday SS, he was able to relax, get back to his routine that he knew in the beginning of the season rather than having to focus on learning a new position, and find a bit more of a groove. In his final 45 games, Bogaerts hit .231/.262/.349.
What helped him most was when he hit the 7 day DL. The game certainly sped up on him and he couldn't catch his breath. Understandable, he's 21, learning a new position at the highest level, watching his team struggle, all while putting the teams struggles on his shoulders. During his DL stint, he was able to hit the reset button, take a breath, and find his stroke again, and played well in the final month, hitting .313/.317/.490, 4 HR, 16 RBI (28 HR, 108 RBI pace) which should help alleviate his "not clutch" narrative.
Did Bogaerts struggle? Absolutely. Horribly.
Can we see any kind of a correlation between his struggles and something else that occured around the same time? Absolutely. Is that an excuse? Absolutely not.
I think Bogaerts needed to stay up and out of AA or AAA because the reason he was struggling was because the book was out on him. The pitchers had made their adjustments and he needed to adjust to the pitchers. He can't do that in Pawtucket. He has to do that against the pitchers who have made the adjustments to him, which is at the MLB level. He'll be much, much better for it going forward.