True. But it doesn't mean that Aaliyah didn't come right after them and make an impact in real time.
Of course she's bigger now than before - she dropped actual classics. Enough time has passed and people realize her music was innovative as fukk. We thought her shyt was innovative back then but it's really obvious now.
Most innovative artists are never huge in the time period they drop their best shyt. They're not ignored either. But it takes time for people to catch up. "We Need A Resolution" blew me the fukk away when it came out, but from what I read, it pretty much flopped as a single. Now of course it's a staple Aaliyah record and everyone's heard it.
Saying she'd be Monica/Brandy/Mya status is laughable because Aaliyah's music was more ahead of the curve than they were. As they waned in popularity, Aaliyah would've only become more notable because that's how these things work. Nas is arguably more popular now than he's ever been, meanwhile no one really cares what LL Cool J is up to in comparison.
Father Time