Over the last couple of years, a lot of information has come out showing that there was a lot more to Rodgers' hissy fit than Love. He had been become increasingly disgruntled for several years, and feeling more and more disrespected.
First (to your final sentence), Gutekunst later admitted that he did not give Rodgers any sort of heads-up, and that he regretted not doing so. In his defense, the day of the the draft things moved pretty quickly after the first 21 or 22 picks, and there wasn't a lot of time to call Rodgers. The Vikings had pick #22 and #25, and when they took Justin Jefferson at 22, Gutekunst reportedly saw an opportunity to move up and grab Brandon Aiyuk at #26 - because they didn't think Minnesota would take 2 WRs in the 1st.
Apparently, they were taken by surprise when the Niners traded with Minnesota and picked him at 25, but the trade with Miami for #26 had not been finalized - Gute could have backed out of it. But supposedly, he decided to go through with the trade and take Love. If this story is true, then there really wasn't much time to call Rodgers... however, Packer personnel later said that the last couple of days before the draft, it was beginning to look as though they might have as much as a 50--50 shot at Love. And as I said, Gute later admitted he should have at least told Aaron before Draft Day that there was a chance they would take a quarterback.
But for several years, Rodgers had developed some resentment over what he thought was a pattern of disrespectful behavior toward departing players, and especially veterans. He started to feel that he was not getting the respect he felt he had earned, and did not like the fact that he was not brought into the loop when Lafleur was hired.
A year later, Rodgers gave a radio interview in which he spoke very well of WR Jake Kumerow, praised him highly. The next morning, Gutekunst cut Kumerow. Rodgers has since said that that one
really steamed him. Several months after that, a reporter asked him to comment on some player, and he said "I'm not going to talk about personnel. The last time I did that, the guy got cut".
Rodgers later said that he tried many times to be brought into the conversations on personnel, and offered a number of times to help recruit free agents, but that "they just tried to throw money at me instead". He also said something like "they made it clear that my job was to just play".
So by the time the Love pick came around, Rodgers was already cranky, and we all know how he can nurse a grudge. Even Gutekunst admits now that he could have done a better job of communicating with Rodgers, and wishes he had.
When the Packers cut Jake Kumerow before the start of the 2020 season, we noted that it came just a day after Aaron Rodgers referred to Kumerow as a lock to make the roster.
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