My head is only just recovering from January so trying to get my head around this one! The way I see it is
2 companies that both have 50/50 husband and wife ownership would not be connected under item 2, but would be under item 6
If those companies were owned one by Mr and the other by Mrs they would not be connected but consideration would need to be given to item 3 which could make them connected.
Here is where it gets interesting - what happens if Comp A has 3 equal shareholders A, B and C and Comp B has equal shareholders A, B and D, A&B are the minimum controlling group and so they are connected