My way too early projections:
LT: Crawford or Mincey (personally think if both players aren't complaining you just rotate them if need be even it worked fine this season)
LG: Addison or Karic
C: Cooper (Addison likely the backup)
RG: Spraggins
RT: Karic or ? (Grant, Perry, Davis are the tallest options on roster with good length...Umarov and Johnson incoming are also potential options)
I'd be surprised if a first year guy takes that RT spot with us having size and talent on roster already... and if Karic isn't long enough in the arms could Addison be an option?
Staff has shown already they will play the best 5 guys on the OL and move pieces if need be. Wright was at LT last season and RT this season.
So I guess ultimately I think your 5 starters are these guys (Mincey/Crawford, Addison, Cooper, Spraggins, Karic) but I'd say other than Cooper at Center and Spraggins at guard where they play could still be up in the air. I do think Karic with 3 years of S&C at Texas will be ahead of Umarov and Johnson from a conditioning standpoint.
You also have some wild cards. Masai Reddick, Mo Clipper Jr., William Parker, & Jackson Lampley (who was a top 250 national player and 4 star)
I think we have a lot of solid options on the OL and it should be good competition. I just hope we don't lose too many to the portal.