I would accept him more as a back up RB than I would a CB tbhOne good thing about Tanganga is that he can do a job at right back. Looked at through that lens - and considering the ridiculously low price - perhaps there’d still be two more centre halves coming.
I'm not a huge fan of him as a RB but as a back up to Hume (and potentially Huggins) then it makes more sense
If he's one of the 1st 4 choice CBs I'd be worried tho