I get it now! It’s totally correct. Tell him to play an A minor 7th. The A there is the 7th (his G)
This is exactly what I played in my version and it’s exactly what they play in the original.
It may be that it sounds a little weird with just you 2 guys but if he adds that 7th it will help. Also, his next chord should be F minor, not F major… this is a common mistake most guys do in this tune.