I have tons of questions on these helmets so if anyone knows the answer to them please let me know, thanks.

Why is it that....?
Jimmy Rollins only player on Phillies to wear Coolflo helmet?

Select Phillies players (Werth, Mayberry, Rollins) wear Coolflo helmet with alternate uniform?

All Brewers players wear Coolflo helmets only with throwback alternates, why not with regular home/road/blue alternate uniform?

Select players on Astros/Twins/Royals/Blue Jays/Pirates wear Coolflo helmets?

Why did the Orioles switch back to the older style helmets in 2009?

I'm assuming with the select players, that it is based on player preference and some teams allow players to select what they want. Thanks for any help.