Actually, I think he's right, that may be the ambient air temp sensor. goes in front of the rad. There should be bracket at the bottom of the support beam, at the bottom of the rad, so you need that one. WHen I say terminated, the grey one from the ABS may be a 'through joint connector' where the plug has terminals inside it that join the wires in the connector and complete the harness.
Best bet is not to be cutting any of them.
Only thing I would do is tape the black open one up out the way.

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i