Newt as VP may have been too high profile front and center on issues of national importance. His remarks yesterday were presidential and spot on. But he and Donald would have to coordinate their messaging, and that may have been tough.
Pence is lower profile than Newt and has moderate as well as conservative support, and he will bring in Indiana. That may have been why he was chosen. He’s also a presence the establishment can’t really criticize.
Newt would be under-utilized as a VP.