Advanced doesn't use SQL, and SQL is pretty good about giving back capacity in a performance crunch, so you should be good. If you want SQL, you'd need to go to Premium and then you'll at least want another SQL Server Express install (Azure AD Connect is not even a full version SQL Server Express).
The main limitations of Express are that you only get access to the first physical CPU socket (up to 4 cores), databases need to be under 10GB, SQL will only use 1GB of RAM and there's no SQL Server Agent to schedule maintenance. Here's a bit more detail:
https://stackify.com/what-is-sql-server-express/------------------------------
Steve Iwanowski, NextStep Technology Advisors, aka DSD Lancaster PA ¯\_(ツ)_/¯
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