I think he is feeling the mighty pull of "These numbers are getting bloated, they must be wrong!" syndrome. I know all too well about this, for I am a minimalist. But I am also a realist. I think I found a happy medium recently, but they will be revealed at a much later date. In regards to the scenario here's some of the things I feel strongly about...
1) I don't give a damn what you have to do, I don't like Yardrat Goku being more than 2x Namek Goku. Period.
2) Future 17's should be roughly 40% against Gohan.
Those are my minimalist guidelines. These are my realistic guidelines.
1) Future 17 (Less than Half) > Ssj Gohan > Cyborg Freeza
2) Future Vegeta at this level is optional, but he should be over Cyborg Freeza and under Ssj Gohan if included.
I will say that the anime is clear on where Future Vegeta stands. He was not a Super Saiyan. At time of death, he is in base. Storywise, I do like the thought of Vegeta attaining Super Saiyan, I think it's possible to work the numbers in decent fashion anyhow.