I think Tierney will come good and like said above, reminds me of Steinsson. His heart is in it and, puts a decent cross in as well.
As for Baptiste, every time he went up for a header he jumped way too early. If he can't get a look-in at centre half now, he never will.
Then again, when the ball isn't sticking up-front or in midfield, a wobbly defence is always going to be under pressure and the inevitable will eventually happen.