I noticed that too. they pulled Clark and put in Simoneau. must have been thinking it was a passing down.
I for one don't understand this liability in coverage crud. Clark has been great in coverage on goaline situations, always picking up his man. Plus he actually makes tackles.
On the other hand, Simoneau, well he probably has less tackles than Clark, yet he has played in about 30 times more plays than Clark. Your middle linebacker should be making more than 2-3 tackles per game.