The 9 game limit shouldn't be that important. Bratt's waiver eligibility should be the bigger concern.
Typically, players signing at 18 have 6 years and/or 160 NHL games before they need waivers. Signing at 19 means 5 years and/or 160 NHL games. But if they play over 11 NHL games in their 18 or 19 year old season, it decreases the years by 2. Devils have been victim of this in recent years with Josefson and Matteau not being quite ready for NHL time, but needing to pass through waivers to go down to the AHL. Instead of developing in the AHL, they stagnated as fourth line and extra forwards in the NHL.
I'm worried a smaller, skilled guy like Bratt might need development time down the road and could be forced up to the NHL too early if he plays too many games in the NHL this year.