To rebut the mandatory inference of Pittman a carrier had to produce direct and positive proof that something other than the disability was the sole cause of claimant’s reduced <a href="https://thelomad.com/getmad.today/wp-contentwww.getmad.today/blog/2013/11/a-blind-leap-across-an-inscrutable-chasm-arbitrary-and-capricious-loss-of-wage-earning-capacity-lwec-determinations/">earning capacity</a> after retirement