Not sure why you seem to be so sold on Nelson-Ododa's impact as a freshmen. Will she play more than 15 minutes a game? What percentage of those will be prior to outcome being decided?
Collier has had significant issues at times in the post defensively if you'll recall her foul trouble issues of her sophomore season.
To the guards, Walker isn't one. It'll be interesting who gets that position considering that fact. And while I like Christyn Williams I don't put my hopes in freshmen as mentioned.
Notre Dame counted on zero freshmen this year. You are suggesting UConn will have to count on two. Of the Irish's best players this year, one was an underclassmen. UConn would have to count on as many as four (ONO, CW, Walker, Coombs) to have any chance. Those are two very different equations.
I'm not sold that ONO is going to make a huge impact, but it's likely that she'll be a rotation player and will make strides by the end of the season.
Collier averaged less than 2 fouls a game this past season. She averaged about the same number of blocks....I wouldn't be overly worried about her being foul prone.
KLS will probably be more of the off guard than Walker, as KLS is a stronger passer and also more of a perimeter shooter than Walker. Regardless though, both will likely play on the wing and be utilized in a way to maximize their strengths.
In regards to the upperclassmen comment, UCONN has never won a title without starter level contributions from at least 2+ upperclassmen. The only exception to this is 2002 when DT was the lone productive underclassman (and an AA one at that). Realistically, UCONN only needs a solid core 6 to win the title, so they'll need contributions from 3 underclassmen. And again, I'll reiterate that they have the two most highly touted underclassmen from their high school classes, so I wouldn't be overly concerned about getting production from those players.
Most other programs have only been able to win titles with lineups usually loaded with upperclassmen (2018 Notre Dame, 2017 SC, 2012 Baylor, 2011 A&M, 2007 and 2008 Tennessee, etc) but UCONN has had little trouble winning with young players playing big roles.