jaydude
Five Thousand Club
If I recall correctly. I think the exact form a weapon takes doesn't matter so much. So long as the mechanics best fit the form you desire. Just as I got a pass for my Dire Lance being more of halberd than an actual Lance or spear. And even then, the biggest mechanic difference between types of weapons is just the tags. Lances and battleaxes are both heavy two handed weapons with same stats, but their tags lets you do different things with them.
Though to that end, perhaps a halberd would have gone more in line with a grimcleaver or grimscythe.
Anyway! I would think whips fall in line easily with the dire chain category. Maybe light for something thing and nimble like a whip, or heavy for massive weapon like an anchor on a chain (which im going to use next time cause that sounds dope)
Whips and fighting chains are both distinctive weapons in the world of Exalted, with them each having their own artifact version (the Direlash and the Dire Chain, respectively).