A sequel will always be more front loaded than a new IP gaining popularity organicallyGhost was a new IP going against one of the biggest Sony IPs of all time and yet it had much longer legs than TLOU2.
Ghost charted 5 times in NPD top 20 in 2020: July (1), August (4), September (12), October (13), November (20).
TLOU2 charter 3 times in comparison: June (1), July (4), August (12).
I bought TLOU2 day one but bought Tsushima months after launch. I'm sure that's similar for many