for your questions:
1: Sablefleck kinda fell in love with Fennelbur the moment he met him. You know the "I identify as morosexual, I am attracted to dumbasses and dumbasses exclusively" meme? Well Sablefleck is morosexual. and he just took one look at Fennelbur and. it was all over.
2: God Rookstorm would be INSUFFERABLE if he was ever chosen to be in a prophecy. Remember how Brambleclaw was constantly trying to take leadership of the group in TNP? Multiply that by eleven hundred and you've got Rookstorm. He's actually be even worse bc he'd deliberately undermine his fellow prophecy cats and take sole credit for everything they all did. And if he was a sole prophecy cat... good lord Berrynose WISHES he could be that much of a brat
finally someone remembers if Fennelbur was there
Rookstorm.. you bitch