Not sure that Family History findings can become outdated!
Havent read through all the previous work done, but just on what is in this post the obvious steps (that presumably have been taken) are : has he been found in a census after marriage? What name and occupation does he give for father on marriage cert? When/where is marriage? Who does he marry? etc etc.
In answer to your question on this thread - yes it is possible to "find" someone when all you start with is a marriage cert, because you move on to other things as listed.
But I guess in this case there is a lot more to it, presumably all usual channels have reached a full stop for whatever reason.
So I m not sure that starting a new thread is going to help. All we will can do, at least to start with to get some more info, is to go over old ground surely?