Dates not as important as sourcing?
I have been putting a lot of work into sorting and sourcing the early Irish profiles at present, many have temporarily lost their dates in the process in order to avoid recreating errors in the errors database which was becoming a problem immediately prior to the last Spring-clean-athon. "Correcting" an estimated date in a long descent lines immediately threw up related profiles as "new errors".
I think it best at this time to ignore dates when profiles are located in a partly dated descent line and to concentrate on sourcing the profiles as fully as possible as has been done for his father Conaire Cóem https://www.wikitree.com/wiki/Mogha-1 Many associated profiles will have sourced death dates.
Note that there are siblings here still to surface, and I guess merges yet to be made. The object of adding categories to these profiles is to make them available in a relocatable source for checking against possible merges and connections.
Recognising these profiled individuals in the variety of names used for them is not always easy - sourcing and rationalizing name fields seem to me to be a more worthwhile endeavour than providing dates in the short term. Estimated dates will fall into place once the whole descent line is securely identified and sourced.