Ro- it's not just Tuchel, it's the club's hierarchy. Who would've thought they'd continue like they have once Klopp left? The club is very well run from top to bottom.
The rumors for Hummels replacements are Matthias Ginter being given a shot. A lot of hype when he first came to the club which he never lived up to. Tuchel has brought him along slowly this campaign & he's played well for him when he's gotten minutes. I think Dortmund fans are scarred of this option though.
The other 2 targets are rumored to be Leverkusen's Omer Toprak & Hoffenheim's Niklas Sule.
Some other names rumored are Borussia Monchengladbach's Alvaro Dominguez, Mainz's Stefan Bell, & FC Basel's Fabian Schar.
Like I've said before, Dortmund is one of the clubs where you should look at who they would buy if had to sell their assets.