When things can be very good, they could also go very bad - I expect the next set of 5 matches he will be on straight-4s ratings and with RC whenever he plays. Lol! (Joking obviously haha!)
Had some similar seasons like that before, though from experience it will come with a short run of 3-4 matches in a row in the middle of the season when such a player just can’t score, then back to top form again. Hopefully yours keep top form throughout the season!