Frankly, the idea of a mainline guy 'flowing' to the top of the left seat DCI list, thereby displacing everyone on said DCI list down one number, is categorically a bad idea for the DCI people. To attempt to spin it otherwise, as has been the case with this thread, is a perversion of logic.
(If this thought process is such a good idea, then why don't we flow the DCI pilot to the top of the left seat mainline list everytime [which wouldn't be often, if ever...] a flow up occurs? It's the same logic.)
Clearly, there is a double standard here with regards to the careers of mainline vs. DCI pilots. How could a DCI pilot be expected to agree to, vote for, and support this lunacy?
Now, if there were a way for the interests of the DCI guys to be considered with the same weight of the mainline pilots, I think that there could be a way to make this happen. Could someone on the mainline side of the house please suggest something that is a win/win suggestion? To date, I've not heard any of that kind of thinking.