Is this a Cave Swallow?

I was going through my lifebird photos (yes, again, AB!) and cropping them a bit more, doing some photo-editing, etc. when I noticed this bird in my shot of Purple Marlins:Perhaps a juvenile Cave Swallow? Note the pale cheek and throat and the pale spot above the eyes on the forehead (non-birdy terms, I know, but you get the idea). If it were a juvey Barn Swallow, the throat would be more reddish. If it were a Cliff, it would have a dark throat. All this is according to Sibley.

What do you think?

I took this photo two years ago in Cape May with Baby G, so it's not like I'm going to count this as a lifer, but I would like to know whether I'm IDing it correctly.