You're probably right (Gwynn rather than Glynn, I'm a bit like Jonathan Woss in pronouncing vowels).
His brother Alan did play at international level.
I remember Davies getting his sine die ban. I believe it was in a cup tie against Trinity and the ref has just given them a very dubious penalty,the latest in a string of bad decisions against Dewsbury, which Neil Fox had hit between the posts to put Trinity ahead. As they returned to the halfway line for the restart, Davies simply let loose a haymaker which put the ref on his derriere. There were more than a few Davies-sympathizers in the crowd. Hadn't heard about the committee-man incident, but I do remember a few who may well have deserved a dowsing. One of these brought a winger called Pratt from Morley RU and pronounced him as the next Roy Pollard. The guy's name should have given him a clue. He could run, but it was only in a direction away from the opposition, backwards, sidewards but rarely forwards. And stopping a paper bag in a gust of wind was beyond him.
I can also remember watching Roger Millward as a schoolboy on Sunday afternoon TV (B&W) with Dewsbury's least favourite son commentating. He was at the time, Eddie told us, "mercurial", which presumably was approaching "ubiquitous". That adjective Eddie reserved for Alex Murphy.
I used to watch those - dewsbury v cas with millward on the cas side and maloney and watson on the dewsbury team was the best one I saw.