It sounds like pure politics to me - Nothing more.
Fair enough - testing new applicants before recruitment could serve some practical purposes, if only to ensure that cadets are more accurate clones of eachother, and will fit into the company's mould.
Testing experienced pilots though? If the head-shrinker with his degree in psycho-voodoo thought a skipper with 20 years experience to be unsuitable for the job, what are they going to do about it? Not a lot, I'd guess, and I'd bet my life savings on that (Presently standing at about -£8000)
Pie