Scottie Scheffler uses a grip trainer before every single round — not because he forgot how to grip a club over lunch, but because he knows grip drifts constantly. After every break, every night's sleep, every change in how his body feels.
If the world number one recalibrates his grip daily, imagine what three to five months off does to yours. The difference is he resets it before he swings. Most amateurs just hope it comes back.