Given the fact that it seems very improbable for all 4 gods to be added to SM2, could an Undivided Chaos legion have been a better choice for the Chaos faction?

Currently the 'Chaos' faction is more-or-less just monogod Tzeentch, and I think not many of us will have any illusions that any other Chaos god faction will be added to the game at this point.

So considering that and in hindsight, wouldn't an Undivided legion like the Word Bearers be a better vehicle for a general 'Chaos' enemy? Seems it would be more modular and accomodating of varied Chaos designs, so different Chaos forces can be added without necessarily adding or overhauling factions. Given their propensity for daemon summoning, extremis/terminus enemies can be relatively easily added to the finished game in the form of various monogod daemons.

The red could also contrast better with the Ultramarines blue, instead of being a blue vs. blue affair. Thoughts?