On the Matt Mervis topic; the Cubs should be calling up Matt Mervis, and they're doing themselves a disservice by not, long term for sure, and possibly in the short. We all want to win games; but is Trey Mancini helping the Cubs win games? He's got a >80wRC+ on the season and his baseball savant page is icy blue across the board; few MLB players have worse batted ball data than Mancini. There doesn't seem to be any reason to suggest a turn around is coming, and he's been worth -.7 fWAR this year. Only 4 qualified players have been worth less than Mancini this season. That's...less than optimal.
Yes, Mervis was not worth much in his 99 PA run. But 99 PA's is just a very small sample size; barely enough for most statistics to even stabilize let alone to be worthwhile to determine his long term future. There were many negatives; he really struggled (especially initially) with swing decisions and the LA was real bad. But the exit velocity data was good, and I think there was some bad luck, especially at the end, working against him. This is a player clearly too good for AAA; he's got a 153 wRC+ since returning and just crushing the league. Mervis really needs to learn swing decisions at the MLB level, and if he needs to make some "very small" mechanical changes, that feels very doable at the MLB level as well; it's not like we're talking a swing rebuild.
So is Mervis any worse than Mancini? Maybe marginally, but his last 74 PA's have been 57wRC+ bad. That's so bad that it's virtually the same amount of bad Mervis was in 99 PA's (46 wRC+). But Mervis has upside, and I don't think Mancini does. So short term, you're probably better off gambling that Mervis has figured something out and will hit. Long term, you need to give him as many PA's between today and the end of the year so you don't go into 2024 with more Matt Mervis questions. Worst case? He bombs, but then you know. Not knowing would be the worst case scenario.
It's two weeks, but the Cubs should make the change. It's better long term, it's arguably better short term. Just do it.