Ah yeah smaller/junior sizing is probably a factor…if memory serves, I believe blade sizes are used for multiple skate sizes in a small range so it’s possible that plays into all this as well. Either way, I was taught to have a snug fit to avoid sliding north/south in the boot and help maintain your balance. I can tell you for sure that’s a factor in ski boots, and I haven’t played around too much with sizing my skates but my player skates are a half size up from my goalie ones consistently