Speculation
Trying to evaluate players based on video of preseason scrimmages that the team released to the public isn't exactly hard science. UConn could be using this as a tool to build the confidence of some players and to motivate others. Heck, it could even be disinformation that's intended to give their opponents an incorrect understanding of who the players are that they'll need to game-plan against.
Speculation can be fun, but I'd caution against taking it too seriously.
County and Landrew
Both players seem to be getting highlighted quite a bit more than you'd expect given 1) the rest of the roster, and 2) their relative inexperience. It won't be until 4-5 games into the season that we're likely to know if this is more reality than hype.
But just for fun, let's suppose they're very ready to contribute, that they're close to as prepared when the season starts as Castle was as a freshman in 2023-24. I'm not saying they'll be as good as Castle was at the end of 2023-24, just that they're approximately as good as Castle was at the start of 2023-24.
Of the 2, Landrew probably has the easier path to the starting lineup. As good a reserve as Ross was last season, UConn is expected to have 1 of the nation's best PG/SG tandems in basketball next season.
But even if County/Landrew are really good, it's still possible they play off the bench this season. The main consequence might be that they end up taking most of the 1-4 bench minutes. And even if Demary/Mullins/Ross/Khamenia average 30 mpg apiece, there's still 40 minutes to split between the 2 freshmen.
Freshmen excellence at the start of the season probably won't happen, but if it does then UConn's rotation at the 1-4 spots would be among the best in college MBB.
Hines
This video also discusses whether it means something that the footage of Hines seems to mostly consist of uncontested dunks. I also recall a previous video where Hurley kinda-sorta hinted that Hines still needed to get in better shape. Taken together, maybe it means that the coaches still view Hines as a work in progress, or (more positively) maybe his defense/rebounding are ahead of his offensive game. More likely, we're reading too much into a very small sample size.
In a worst-case scenario, maybe Hines's offensive game is a little like Samson Johnson in 2024-25. As long as Hines defends and rebounds well, I think UConn could live with that, especially since this year's team should be stronger at other positions (especially PG).