At least he's still in the starting lineup. Sometimes batting at the back of the order is a good thing to take some pressure off. A good example is Royals CF Kyle Isbel. He's a tremendous defensive player but was struggling at the plate. The Royals moved him to the 8th-9th spot last year and he became one of the most reliable hitters for the team. Made it so that the back of the order was still dangerous.
You probably nailed it; reason he was likely moved back is to take the pressure off him. Mets young, top prospect Carson Benge is also batting at the bottom of the order, after a torrid spring training. He's currently batting about .100 and could be
demoted to AAA if it doesn't turn around. Benge's issue is he hit a deep HR in his first game and is probably swinging for the fences every at bat. Not good, for an average sized player! I'd assume Griffin will have similar pressure on him, if his average continues to drop. Hopefully he turns it around soon, as I'd like to see the Bucs do well.
By the way, the Dodgers are currently batting .299 as a team. The other
29 teams combine are batting .232 thus far. Since, about the 2nd half of the 2015 season**, batting anywhere close to .300 has become very rare, even for the best MLB players. It's basically 3 outcomes: Walk, Strikeout or HR. As even small players swing for the fence -- around that time, Scotter Gennett hit 4 HR's in a game. When he came up with Milwaukee, 4 HR's in a month would've been a pleasant surprise.
**Early 2015 there was a lot of grumbling (probably from ESPN and Fox (((execs))) that there was not enough offense in baseball. Come 2nd half of that season, balls started to fly out of parks with much greater frequency:
2015 mlb juiced balls - Google Search