Knee Trembler
I think it is all about money.
I reckon the TP Fleet manager and other TP captains in the said company would be quite happy sat in the right hand seat of a jet as long as they are paid on the captains pay scale. All to get experience as NSF says.
But I also believe that Jet Captains or FO's who come the other way down to TP's think that they are superior to TP guys with experience on type, which is wrong, unless of course they have gone up from TP to jet and back down again