I think there should be an SSG co-op version (just like what's in bedrock)

Why? In RSG co-op you have 2 people gathering stuff in order to get to the end, and once there can both deal damage to the dragon and destroy crystals. In SSG, the end portal is already completed and there is no need to destroy crystals or use a bow, since all you should have is beds and some blocks. SSG co-op would essentially just be 2 people getting in each others way and SSG 1 player would actually be faster.

It would be cool and you use beds in all runs not just SSG

the coop could be like maybe 8s faster at best

The co-op can possibly be faster (one player will look for the beds while the other builds the nether portal, crafts ... etc) but I'm not sure the difference in speed is so huge ...

co-op apart of being extremely hard to make coordination, even while making perfect with that, there is almost nothing to save in an absolute perfect coordination building the nether portal with the chest and with the beds, it could save maybe like 4-5 seconds i imagine, but too hard, first you would need making a good play with both players and actualy is hard to get with 1 so yeah more than using it as a pro to work together both, a co-op in SSG would be a more challenging way i guess at least in pre-1.9 it would be better because you have to get all to complete the portal and is not all full

@Doggo15 I know that other categories use beds too, but have you ever watched an RSG co-op run? They actually get prepared with gear and bows and stuff and break crystals before the dragon perches. Also I'm not seeing how cool it really could be. In co-op RSG you could have 1 person getting blaze rods while the other gets ender pearls, but in SSG the portal has all 12 eyes in it already. Of course it could help optimize certain things such as in 1.14 when 1 person builds the portal and the other loots the village but I feel like in most cases it will just be slower and more complicated. RSG is just so much more capable of more than 1 player as there's no specific route, you don't just know where the portal is, you have to figure out time saves as you go and not plan them, you have to find a fortress, etc. There are just so many times they will get in each others' way. This is why I think SSG co-op is a bad idea and shouldn't be added.