I don’t think that all these photographs represent the same species.
I’d suggest Amanita sp. 5 for 15713.
15715 (with apparent double annulus) is probably either A. cokeri or A. species 5.
When the bulb is missing, it’s really very difficult to “do” a Lepidella.
15714 is neither of the above.
For lepidellas, close-ups of cap warts are very valuable diagnostic shots.
Note to the administrator: According to the list of names of authors of fungi, the standard form of Gilbert’s name has a hyphen between the initials…i.e., “E.-J.”
Very best,
Rod