Those comparing this to Sanchez are wrong.
In that case Sanchez said he wanted to come to City then flirted with other clubs and upped the ante in order to still agree to come here.
THAT was the problem. That we were just an option and if others paid more then he would go there.
Laporte chose to stay where he was and is only talking about coming here. He will have to persuade Pep he means it this time but his past decision to stay will not prove disloyalty.
Remember that even with Sanchez the City statement said the door was open for him to come to City on the originally agreed terms. So it was not the issue that he had offers elsewhere. Just his determination to join City over anyone else.
If Laporte's agent starts getting United or someone else involved and he wavered over wanting to join Pep's City project then that would be the kicker, not his choice to stay where he was previously.