They are attacking full backs.
They have also had to play alongside some of the worst central defending witnessed at Ibrox, (Kiernan ,Wilson , Cardoso , Martin and McCrorie).
They will now have proper central defenders alongside them and 3 narrow central midfielders in front of them, giving them proper protection.
Giggs was wholesome in his praise of John when playing for Wales recently and both McAllister and Gerrard have both come out and spoken about what Tav brings to the team.
If either of them aren't doing it, then Flanagan will putting serious pressure on them.
Why not ask Jordan Jones or Scott Sinclair whether or not Tav can defend?
Neither of them get any joy out of him.
For avoidance of doubt, Ross McCrorie is an excellent DM, but made too many individual errors in CD.