He has wreaked havoc soo many times I'd love to have him on our side. And then there is this
The Chargers need to free up over $20 million in cap space this offseason and Allen has become a prime potential candidate to be cut or traded. While there are several reasons against cutting Allen, sometimes in the NFL teams have to make a tough business decision.
If Allen were to be cut by the Chargers then there is no guarantee that he wouldn't sign with the Chiefs. Kansas City does not have the cap space to bring in an expensive WR1 but if he is willing to take a pay cut, and essentially replace Juju Smith-Schuster's cap hit, then it could be a possibility.
If you are Keenan Allen of course you are going to be intrigued by the Chiefs. They have been the most successful team of the last five years and Mahomes is one of very few quarterbacks that would actually be an upgrade from Justin Herbert.