I might be wrong here but I think agents get paid off the percentage of a signed contract. Therefore, I think if Kyrie signed a deal while repped by his old firm, then fired that firm, I believe that firm still gets paid and Kyrie's new firm would need to rep him without getting that agent fee for the contract.
Which kind of means, that if a player wants a new agent, they are going to hire that agent just before that player needs a new contract negotiated so that new agent gets paid off that new contract.
I guess I am saying, if Kyrie was going to switch agents, that the timing makes complete sense.
Now, I might be wrong on this, but if I am not, then the timing of the switch to a new agent really may not mean anything.