Popa would have had a good look comparing Teague and Triantis on the training ground in like for like.
I think Mr Cleansheets put up a post of Trantis highlights. Didn't see all of it, but highlights can make anyone look good if all their best moments are assembled.
One has to appraise how they move off the ball. When they made a mistake by making the wrong covering run, or was it too late?
Did Triantis fail to track a marker on a number of occasions?
In one instance where T beat a player ( impressively) and shot, the camera didn't show how he ran in the Defensive Transition to recover the ball when the opponents regained it.
It also didn't show the many occasions when T's running to support the ball carrier could be appraised, if the ball wasn't passed to him.
Look Celtic is a brilliant possession team, but a lot of the Scottish league I've seen in Cup games has poor running off the ball to support ball carriers. At best quite a few Scottish teams would play like Auckland in the AL - effective, physically strong, good aerially, very disciplined as a team unit off the ball, but possessing little flair.
The Scots turn the ball over a lot.