Incentives.

[RyojinOrion]

I was thinking that if you were alone there would just be something that you could carry yourself. It might be slightly different from the multiplayer mission.

 

While it is an interesting idea, it doesn't really make a whole lot of sense to be able to carry it by yourself while playing solo, but not being able to do the same while in multiplayer. It is also more of a roadblock style idea rather than an incentive to stick together, so it doesn't quite suit the purposes of this thread.