Neither point to a culture issue. They point to 2 married guys wanting to go play for $$$. And EB's case where he has been injured and probably wants to go make money while he can and to avoid risk of further injury in 2018-19 before getting a check.
Next, the rest were not renewed. Pretty simple. GO read Jeff Chatman's posts on Jordan leaving. Weren't happy about it. Same with Isaac Nielson, who you didn't list. Toolson over PT not culture. Carlino over being a selfish kid, not culture. Bartley is more than you listed. Not culture.
Point being, the guys you listed who left, don't point to them not wanting to be part of the program over culture. They point to many things, but not that. But mostly to kids either wanting 1) more PT, or 2) go pro to make $$$ before injury, or 3) being invited to leave.
Gone are the days of kids staying 4 years. They want to get paid or play more. Kentucky, Duke, UNC, Kanas, etc etc all lose kids to go pro. That is''t close to a BYU issue that points to a program problem.