His sole (stated) reason for acting when he did was his seeing the Senate seat up for sale, and he wanted to prevent such a terrible thing from happening. And with what he already had on Blago it was a no-brainer. Get it done! That’s fine.
But there’s also the implication of person of interest #5 who apparently discussed a quid-pro-quo with Blago. And perhaps even one more individual who also mentioned $ for the seat. It will make it harder for Fitzgerald to prosecute them without the completion of the deal. So that makes me wonder about the timing of all this.
The two alternative explanations out there are Obama’s camp pushing the arrest for political purposes, and Fitzgerald’s pushing the arrest for job retention purposes. These aren’t necessarily mutually. But, they are simply conjecture with no evidence of fact (at least that’s known at this time).
“#5 who apparently discussed a quid-pro-quo with Blago. And perhaps even one more individual”
Maybe Rahm caught wind of it and contacted Fitz? That would protect Opossum. The other 2 might be brought in to testify under threat of a conspiracy charge.