I look at it this way: Tyron Smith is an upgrade over Tyler Smith at Left Tackle. Yes, Tyler is improving, but Tyron Smith is a hall of famer whose play hasn't dropped off too much. At left guard, Tyler Smith is a massive upgrade over Conner McGovern, especially in the run game.
Team believes they already have Tyron's replacement in Tyler Smith, his contract expires after the season. The team needs to prepare to find new starters at both Guard positions, left guard is more immediate. This year the need is more of a contingent plan in case injuries occur. That can be addressed in fa or in the draft process. In my opinion, they aren't going to draft a 1st rd lineman to sit on the bench and that is what would happen, he only plays if injuries occur. After the 1st rd, can see it, but not with our first pick.
In my mock yesterday, I had them taking Bergeron who is a ready player that can play either Guard or Tackle. Ideal type of player that fills this year and future needs.