This would apply if no beard was a genetic trait. Don't think is an issue as there is not a significant report of verified beardless Toms. I'd speculate the beard is there but lost due to some physical circumstance.
This old bird was down to two visible strands and if he kept his distance would of passed as a breadless Tom however fortunately for me walk too within yards for a visible confirmation.
https://live.staticflickr.com/955/39...3a3c91d3_z.jpg[url=https://flic.kr/p/23LxukS]
In any case good to error on caution as the possibility may exist however unlikely