I'm surprised [as are many] that Adam Beard has been brought in for Jones. I'd have thought Johhny Gray or James Ryan, although I understand that Ryan has picked up a thigh strain. Beard is a good player but Gray offers so much more, specially in his physicality.
Josh Navidi coming in for Tipuric is more understandable. Like for like, openside for openside, Sam Underhill is the obvious candidate, but again I believe he has picked up a head knock in training. Navidi is an 8 or blindside but is a class player and unlucky not to get selected in the first place.
Gatland must be hoping that Hamish Watson promptly recovers from his concussion, at the moment Tom Curry is his only openside, even though he usually plays blindside for England.