SLI’s and “stove piping” aren’t based on what you currently hold but what your seniority could hold and positions available. This career is about choices. Hopefully a 121 pilot at this point understands this. If the #1 pilot at HAL was on the 717 it’s not like they would be scrambling to bid the 330/787 to protect their seniority. Bid what you want, want what you bid.