I also hear him say he's "RTB and clearing off" when he gets to last waypoint....but he doesn't. Watch him, he will continue to fly the pattern.
Regarding the data link, you have to go through the entire JTAC/AFAC radio sequence, the last thing he will do is give you the data link. It goes something like "I'm here JTAC, reporting in", he gives you target coordinates, then you read them back, then he gives you follow up information, THEN he gives you the data link.
I used to make the mistake of bombing the target without reading the coordinates back. It screws up the JTAC logic.