It's more likely he was the best we were able to attract out of the portal.
First, GT has not been very good the last few years and lost most of its proven playmakers on offense.
Second it has a returning starting QB.
If you look at where the top ranked QB's in the portal went it is largely to teams that were already good that lost their starting QB.
Ewers to TX, Williams to USC, Dart to Ole Miss, Rattler to SCe, Gabriel to OK, Johnson to TX A&M, Slovis to Pitt.
In every one of those cases the QB is walking into a situation where he is expecting to start and play for a winning team.