I DID NOT want Red to turn out to be Katarina. Red said who he was in a diner with Liz, "I yam what I yam" he's Popeye the Sailor man, meaning he WAS Red Reddington, Naval Intelligence.
I cried at the end of this last episode, but not because Red died, but because these network interferers and johnny-come-lately show runners had Red, who out maneuvered the Police, FBI, other bad guys, et al, killed by a bull. Just stand there and wait to see if the bull would charge. Stupid ending. Worse than "How I Met Your Mother".
My ending may have been like this:
Red takes his walk, sits in the field and Liz is sitting next to him, they talk, get up, walk a little, then Liz fades away and the bull is there, if they had to use this bull ending.