He wouldn't be Sessegnon's replacement. He would be Rose's.
Trippier is not suddenly better. He's had a few good games, a few steady ones and one horror show. It's certainly not a big enough sample to say he's back to the big time. Considering you've admitted you haven't watched Atletico I'd fall back on pretending you have a clue about his form.
He was a shit show for us, for more than a year. If you don't believe me, believe him...
Atletico Madrid full-back Kieran Trippier says "there's no excuse" for his poor Tottenham Hotspur form during the 2018/19 season.
www.squawka.com
As for Sess, he wouldn't be ahead of Lucas, that is one option that I said COULD be on Poch's mind for Sess. Sess is 19. He could easily be Son or Lucas' understudy. To eventually take over the 27 year olds in a few years when they are 30 and he is 22. Until he's fit we won't know.