The AAIB report is not the result of an investigation, but a simple statement of the event from the captain. Evidently he handled the situation very well, with one good arm and one good brain and only a few seconds to sort the problem.
Not enough time to hand over to a first officer, whose qualities are not specified.
There was evidently no damage from the heavy landing, and the 47 passengers noticed nothing unusual for a landing on a gusty runway in Northern Ireland.
The captain's eight thousand hours, with 1,871 on type impresses me with his first rate experience and the respect of his employer. Missing a limb does not disqualify you. No doubt the technical problem of the arm attachment will be sorted. Overworked pilots who end up camping in the pilots lounge on lowpaying regional airlines would worry me a lot more than a man who has shown he can deal quickly and sensibly with a technical problem.