My take is that the difference is that Cally wanted out. Stepan wants to stay.
Just the way I see it.
I don't think Cally necessarily wanted out. I just think he wanted to get paid, regardless of where. He had his agent whispering in his ear and leaking crap to the media about the Rangers "paying FAs and asking family to take less."
Callahan was already declining during his last couple seasons here, and wanted to squeeze every last cent out of what would likely be his last contract. He also got the NMC he wanted from TBL. And before anyone says NYR actually offered him a higher AAV, sans NMC, $5.8M in TB is more money than $6M in NY.
The Rangers and Stepan will find the right figure, I'm sure. I expect it to be $6.25-6.75M AAV on a 6-8 year deal.