Why would ORD based pilots suddenly decide to go to DFW instead of staying in base?

Because they came to Envoy for DFW and were prison sentenced to the CRJ. Mostly DEC's.

Prison sentenced? You know they can bid away from the plane immediately?
2 from our class are now in 145 class.
Every DEC we had wanted ORD.

There are still FOs that went to the CRJ that would rather be elsewhere. They were not able to bid off, but will be when the plane leaves.

Don’t forget to factor the CA’s and FO’s that are lineholders at other bases waiting to bud back to DFW when they can hold a line there. There’s quite a lot of them.

So current snapshot isn’t entirely accurate.

There are so few of them that it doesn't really make any meaningful movement either way.

You don't think ~50 very senior FO's parachuting in above you will mess up your bid?

So, is DFW the most senior CA base? What after that?
Thinking for the 145...but, still unknown at this point.
Interview for possible DEC next week...you know, to see if they like the smell of my cologne.
And, yes, I'm well aware that I will be on reserve until infinity...I've got the concept. Which is why I would want to live in base.

Most JR CA Lineholder breakdown:

DFW 175 4/16 hire
ORD 175 8/16 hire
DFW 145 9/16 hire
MIA 145 1/17 hire
LGA 145 4/17 hire
ORD 145 6/17 hire
ORD CRJ 8/18 hire (DEC)

Thanks bigtime.
Kinda looking like Chicago...ouch.