Mating sharpnose puffers?

Images: 
IMAG0319.jpg
IMAG0318_1.jpg

Diving at Sand Bottom Cave, French Reef, upper Florida Keys, I saw 3 sharpnose puffers.  The largest one was keeping the mid-size one away from the smallest one.  The smallest one had "normal" coloration but the 2 bigger puffers were mottled.  Were these males trying to spawn with the smallest one?  The activity was always centered around the smallest puffer and followed it wherever "she" swam.

Design by Joanne Kidd, development by Ben Weintraub