I remember that being mentioned, although I can't find anything to confirm it.
[img]https://i0.wp.com/gamerfocus.co/wp-content/uploads/2015/03/digimon-ova-5.gif?resize=500%2C280&ssl=1[/img]
From this shot here, it appears that Greymon is ten feet at the shoulder, and in more of a long than tall stance. I understand not wanting Digimon too large at the beginning, though I was only looking for a visual reference, and not any kind of attack boost out of being that large.
And at least I'm not trying to pull this off :P
[img]https://img2.webtoons.top/image/2021/12/31/digimon-next-vol1-chapter-1--welcome-to-the-digimon-net-game-21.jpg[/img] 
Although I do find this scene very funny.

Although on further inspection, Greymon is right next to a car overpass/underpass, it seems, which, if we can find the average height of one of those in Japan, should give us a general shoulder height of the Greymon from the OVA. But that's kind of off track and unnecessary.
The point was, OVA Greymon rarely talks, as does the big Agumon in the OVA, and that was more of the lead-in, tbh.
EDIT: I'd be happy with a ~3 by ~7 meter Greymon X. Smaller than a [i]T. rex[/i], but still considerably large without being absurd.
[img]http://www.prehistoric-wildlife.com/images/species/t/tyrannosaurus-size.jpg[/img]