I think people seriously underestimate what one player can do for the entire chemistry of a team (good or bad). There have been countless examples in recent memory. That isn't to say Rickea is problem at all.
This 100%. Adding in more talent to a championship caliber team has a history of not always helping even if that player is a wonderful teammate and contributor. Some notable examples:
2019 Notre Dame wasn't as good as the 2018 version despite having the same roster but upgrading Kat Westbeld with Brianna Turner.
2018 UCONN wasn't better than the 2017 squad (debatable, but I thought 2017 had better chemistry all year) despite returning everyone but Chong and adding in Stevens.
2013 Baylor wasn't as good as the 2012 version despite having all contributors back and adding in a very good freshman PG, Niya Johnson.
2007 Maryland was worse than the 2006 title team despite returning all 5 starters and bringing in a high profile transfer in Sa'de Wiley-Gatewood
2001 UCONN (even when fully healthy) wasn't as good as the 2000 team despite returning all rotation players plus adding in DT.
1999 Tennessee wasn't as good as the 1998 team with the same lineup but adding in Michelle Snow.
Right there are 6 teams that a lot of people had penciled in for a repeat title due, but the chemistry just wasn't the same once new talent was added in. A talented player like Jackson will definitely alter team chemistry at a program like SC since it forces player roles to change. If I'm Dawn Staley and know I have the chemistry and roster to win a title next year without Jackson, I'm not sure I'd go after her (or anyone else in the portal) solely for this reason, especially since she's likely WNBA bound after 1 more year. If I'm a team that is a piece or 2 away from being in the title hunt, or if there's a need at her position, I'd definitely pick her up.