I think Jayden didn’t look as good as he could have (and did later that year) in week 1. That is typical, but to the extent/difference, maybe not. Significantly, there were timing issues. I have read plenty of analysis saying that the preseason that year may have influenced the supposed slow start.
That said, your point is definitely well made. That was a tough first game. As time passes it is harder to remember but I do recall Jayden being very off in that week 1 game which turned out to be very uncharacteristic for him.
Fast forward to 2025 we have another slow start for Jayden, rough WR situation and then his injuries ended up killing any possibility to see if it would end differently.