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After 20 years playing rhythm, you may have to force yourself to loosen up a bit. The best leads often play 'around' the actual beat. This is why a solid rhythm section is the backbone of any good band. It allows the lead to be more creative, while the rhythm, bass and drums keep the song on track.
You may also discover that your lead player needs to tighten up a bit in order to lay down a solid rhythm with the bass and drums.
I can guarantee that you both will become better players.
Best of luck! :)