He's going to send the wizard and another sailor. Not the cleric. Partly because he's worried that doing so will anger Sarenrae even more, if she can tell, and...partly because it's possible the message Sarenrae was trying to send wasn't even hostile. He still has no idea how to interpret it. He does, however, want to maintain avenues of communication. It might give him warning if she's working against him, and...it's not impossible that it could be valuable for something else. Clerics can convey messages back to their god, he thinks. He doesn't want to do that right now, but his head is still full of niggling confusion and some part of him just wants to keep as many options open as possible.
- for some reason it was tempting not to send a report back at all. It would be irresponsible and stupid to keep risking himself without sending a message back, though.
It was also tempting not to share the coordinates for Golarion. Mhalir doesn't fully understand why - because he wants to keep his juicy find all to himself? He does include them, because it would be very conspicuous not to.
He doesn't, however, specify anything at all on the ship's experimental design or extraplanar routing, which is less notable to exclude, but is nonetheless necessary to actually reach said coordinates. Probably there's someone among the Yeerks who can reverse engineer the ship and the route, if he fails to return. But...he's not sure what, exactly. It feels like it buys him some breathing space, and he doesn't know why he wants that.
As soon as the encrypted message is transmitted and the hosts have been transferred, he orders the jump back.