First, maybe the Packers are actually thinking its time to draft Rodgers replacement and they are seriously considering a big move to do so. A month ago Tua was being mocked to the Packers at 30 by some, but with his recent show of recovering well from his hip injury, I now see him in the top ten and even 5 of many mocks. Way out of the Packers affordabilty.
The second reason Gute might want to visit with those QB's is the simple smoke screen effect. QB's are valuable in the draft, especially perceived first round talented QB's. If any of them are appearing to be available at 30 and there is a team that really wants that player, that team might come at the Packers with a trade offer. Gute might be able to get more in the trade if its public knowledge that the player was in Green Bay for a visit. Gute just tells the team "yeah, we really like him and are considering selecting him, unless you can sweeten your offer".