What if Grover was on the argo II

First of all, all characters belong to Rick Riordan.
What if Grover went on the argo II?
Grover's best friends are put on a dangerous prophecy and Grover is entrusted to join and help them.
This is starting from Mark of Athena and ending with Blood of Olympus. This will be long since we're pretty much rewriting three books. (This is a collaborative story between me and my friend :b)