A Little Help pls

[Renegade]

Technically, that is no spy on the Soviet side. That's a generic spy. A spy on the Soviet side would be a specific Soviet spy
Besides, I clearly stated I prefer that. Ultimately, it doesn't matter, because, contrary to what you said, he did not ask for a spy on the Soviet side, but just "to train spy".
However, your statement is clearly false - this solution does not "achieve the same end". By just making the Allied spy generic, you have a piece of infantry with Allied graphics, Allied voices and Allied-style cameo on the Soviet side.

Yes, it does achieve what the original poster actually requested - the ability to train the spy. But that doesn't change the fact that it is the embodiment of a quick & dirty hack, and that the alternative, much prettier and cleaner solution, is only minimally more work-intensive.

A quick and dirty hack damaging the look & feel of the Soviet forces does not "achieve the same end" as expanding the Soviet forces with a dedicated spy.