You've picked Gibson's worst game of the season (and likely one of Walker's best) to compare the two. In Norman, Gibson scored 13 points while being guarded by Walker and others; Walker scored 3.
On the season, Gibson averaged 13 points to Walker's 5.
Personally, I don't want anyone with even a whiff of aggie wearing crimson and cream, but I don't get a vote.
That's an antiquated perspective in the day and age of the transfer portal.
Walker is four years younger than Gibson and has more natural size and athleticism. Is Gibson a better player today? Sure, but let's see in two years.
I see nothing that says Walker can't become a double-digit scorer while also being a very solid defender that doesn't get exploited by every guard taller than 6'1.