I don't like that at all, and yes, there's no connection. Having Sami/KO help Cody just turns it into a giant clusterf*** of over booking.
The Rock on night one makes zero sense. Who wins the Rumble? Cody? Kind of makes his rumble win seem much less important knowing that Roman is already penciled in to face The Rock (which you can argue is as big or bigger of a spectacle) on night 1. There's absolutely zero reason for Roman to be on two nights...
Instead of the Rumble winner getting a true main event, he gets a weakened opponent on night two. They'll always hold that over the Rumble winner.
As for KO and Sami... I'd love to see a feel good moment, and we will. They'll be winning the tag titles at Wrestlemania over The Uso's. You can start that journey by having Sami vs Reigns in Montreal where the fans will be rabid and you can put Sami in a situation where he goes 20-25 minutes with Roman giving him EVERYTHING he had without winning the title. That would get him just as over. Then, after the match you can have the Bloodline attack Sami and KO makes the save sending the fans home happy in their hometown.
Until the reunion of KO/Sami you can have KO look like he wants to help but then ultimately avoid helping Sami in the weeks leading up to Elimination Chamber. I guarantee you at the end of the EC match between Roman/Sami you'll have 20,000 people chanting for KO, then when he comes out the roof will come off in Montreal.
It's simple.