If you go back 10 yrs, and certainly 20 yrs, you are talking about a "different game, with different players, in a different era." To make any comparisons beyond the present, we have to put things in the context and compare results of that time; not what we think it would have been today. ANY Longhorn player that had a great college career (worthy of having his # retired) and NBA HOF'er SHOULD be considered regardless when it happened. The game changes a little almost every year so this comparison will happen to ALL players at some point.
This is why any list of "best ever", or "GOAT", or Mr Rushmore reps, etc. should have a time frame applied to it such as my greatest players of the last 20 yrs or something like that. Even the game that Mays and Moore played deosnt apply to today. If you dont apply a framework, then any Longhorn basketball Mt Rushmore SHOULD start with Slater Martin just as any presidential Mt Rushmore should start with Washington