All the maybe's aside, what makes the MFWP above the law. They committed a more serious crime than what they have charged the "criminals" with. If these guys were serious poachers, I'm sure they would be charging them with something more serious than trespassing and guiding without a license (both of which sound a little shaky after reading more on the situation). The ONLY felony they are charged with is unlawful possession of a sheep that the MFWP killed!...which, if the trespassing charge fails the unlawful possession would fail too as that sounds like the only thing that made it illegal (tag was valid, open season). And who wouldn't pay $5000 for the Montana state record sheep head if you have the money? The whole thing sounds like it is treading dangerously close to entrapment.
Having had 5 yrs game law enforecemnt experience I would have to say the agent went far beyond the limits of 'working undercover' and should be summarily fired...then arrested and charged with multiple aggravated misdemeanors to equal a felony.
I hope the agent doesn't land a job at the FBI busting people that hire hit-men.