Sorry for the late reply.
"Why not?" is probably a good response.
There were a few issues that factored into it.
I've always fit into 14 oz gloves much better than 16s. First time I bought Boons, way back during the 1st generation models, I bought 14s and 16s to try them out. The 16s felt loose & baggy after they broke in and I really didn't that pair; the 14s on the other hand kind of hurt to break in but afterwards they were awesome. Ended up selling my first 2 pairs to friends who fell in love with them. When it came time to get new Boons, 14 was my first choice. I ended up having to get 16s for sparring. One thing about me is that I always like(d) to rotate my gloves. I think a big reason gloves & padding break down is when you use them when they're still damp from the prior day's training. So I picked up the pair of 12s because I was more likely to do extra bag & pad work on a daily basis than sparring. 12s give the most realistic fight glove feel, so i can work on my defense & proper hand positioning. The fit on the new 16s was better than the old 16s, but still loose enough that I would occasionally try stuffing knuckle guards in there, which made them feel huge & would make my hands cramp up; so I decided to keep them loose & just for sparring. Also by keeping my sparring gloves only for sparring & out of the daily pad/bag rotation, my hands were clean in regard to protecting my workout partners.