BALPA and the majority of BA Pilots know this.
Sad fact is, most pilots know very little about the operation of an airline and the management actions that are accepted by shareholders.
T5 will calm down and work reasonably well in a few weeks.
If WW can show that the pilots (BALPA) are being unreasonable with their demands, shareholders will give the affirmative nod to management.
Will it turn ugly?
Nope, don't think so.
The BA pilots don't have the starch in 'em.
About the only thing that the BA pilots can hope to achieve is some kind of assurance that OS will not disrupt BA schedules, so that they (the BA pilots) can claim success.
Kurtz has it right, unless of course BA pilots have been sniffing the wrong stuff for too long...