The weird truth of the matter is that it seems Future Guy's only real agenda was to tell Archer about the Xindi. In fact everything about the TCW episodes in Enterprise's first two seasons seems centred on making sure the NX-01 is ready to fight the Xindi.
We ignore Broken Bow, since Future Guy even states it's too early for humanity to be involved in his plans, and indeed Silik was at first willing to let Archer walk out of the Helix. True, Silik does attempt to kill Archer once Archer reveals he knows stuff about the TCW, but we can write this off as Silik being impulsive and not acting on Future Guy's plans. In Cold Front Future Guy sends Silik aboard the NX-01 specifically to prevent an accident which would have destroyed the ship. In Shockwave the Suliban destroy a mining colony and frame the NX-01, getting it recalled to Earth. Perhaps the intent was to have at, or at least near the Sol system so that it could be deployed to the Expanse in time to stop the Xindi after their first attack? Future Tense is just the NX-01 getting caught in the crossfire between the Suliban and the Tholians, and in The Expanse Future Guy finally tells Archer about the Xindi.
I don't dispute any of this at all. You're right. All I just meant was that, in 2001, when Broken Bow first aired, my initial thought was that Future Guy would end up being a future Romulan. I realize now after seeing how the events unfolded that he wasn't a future Romulan, and was never intended to be. They were just making it up as they went.