Lanky plant

Hey Guys, So my first set of plants are now in flower for about 6 weeks or so (indoor/outdoor grow) and I have one plant that REALLY different, Most of my plants are what I know as Purple Skunk (auto flowering) sativa I think. but anyways there one plant in the batch thats radically different. It hasnt been keeping up with the flowering of the other plants. I know its hard to do, but just by these pics can anyone help with an ID on it or if its a runt i just need to get rid of? I'm planning on keeping it either way to see what comes of it. Im thinking that its just a pure sativa (not sure what strain) and not an auto flowering. They were planted April 8. and it looks like its just really started to flower. ALSO here are some shots of the others in the batch, can anyone tell me about how much longer they might have to go...

Group shot:


Here's the plant in question:




Some bud shots of the other plants in the batch, any idea on how much longer, been flowering for about 6 weeks or so.











Purple stalks of the plant:



Any thoughts would be more than welcome. Thanks.

C'mon guys, dont all answer at once... Seriously though, any input here?

dude when in dought get rid of it as soon as possible u dont want to take any chances of it being a male and ruin all ur other plants i know its hard to get rid of one but do it.

I get a plant like that every grow. Just a stragler. I dont worry about it, I just yank it. You have plenty of other great plants, why stress on it. Pull it. And it looks like you still have a couple weeks still till harvest.