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So while looking over the KFF for wording on a doubles tourney I came to the realization that it states "... gives all units within' 6" of the Mek a cover save of 5+. Vehicles [get a 4+]" (paraphrased for redundancy)

So by that wording an enemy tank within 6" gets a 4+ cover or with a single infantry in range gets a 5+ cover?

No.

First question on the 3rd page of the main rules FAQ.

Here.

Nice, didn't even think to look in the BRB FAQ

Yep. In order for a friendly anything-at-all that affects other friendlies to affect an enemy, it must have specific permission to do so, e.g. "every model - friend or foe!"