(Spoilers Everything ) Blackfish & Jon Snow ?

As ld mentioned in a previous post, I'm on my second read-through in as many months... on Jan 1st I decided to buy the Google Books "box-set" ASOIAF ad Spent the month of January (re) reading the 5 book Set as quickly as possible. On Feb 1st I finished,and immediately restarted reading the entire story over again -- at a much more deliberate and Studious pace. ( Hey, the set was like $40 bucks! Might as well get my monies worth !) Quite literally,I have "many and more" things I want to discuss ... but this is something I cannot remember em Seeing discussed.

In AFFC Jaime goes to lift the Siege of River Run and treats with Byrnden Tully the Blackfish. He offers (fairly truly) generous terms including the option of Ser Byrnden taking the black. Ser Jaime mentions Jon Snow, Ned Stark's Bastard', has become Lord Commander.

this seems to absolutely bother the Blackfish,who narrows his eyes, wonders if Tywin Lannister made that happen,and mentions how Catelyn never trusted Jon-- as she neither trusted Theon Greyjoy ...then he says; " it would seem She was right about them both..."

What's he upset about and what was he implying? Catelyn was downright wicked to Jon Snow , but he never did anything to her ' and certainly not to Blackfish. what was she right about? And what would that have to do with Brynden not liking Jon?

Could Blackfish Know Jon was named heir to Robb and is, effectively, King in the North and King of the Trident now? Wouldn't Blackfish went to tell Jon? HAVE to by duty and honor?

hmnm .......