I'm still not convinced.

There are subtle things that make me doubt it's McAllister.

For one, he seemed afraid of death, i reckon RJ would welcome it, urging Patrick to kill him. He didn't seem sure of himself enough.

The information he held (what little he actually revealed) could have very easily been told to him by RJ himself. There is no way it'd be that easy to just kill him. I'm not sure why but something seems off...