Any particular reason? I enjoyed his work with John Stewart in Sinestro #7.
If John turns out starring in Lost Army, I'm hoping it means that we see more of his dynamic with Sinestro and Soranik Natu, since Cullen Bunn would be over all those characters. Jensen kinda' left us hanging with this scene. Maybe he was setting something up for Bunn to work on later:
Though, I also echo the sentiments that the best thing would be to continue to use Van Jensen for John Stewart. He's proven to have a great grasp on the character, and the John Stewart fans really trust him. I'm going to greatly miss this current creative team. They are excellent.