Well it's lucky that Beyer had that injury, because it would be a shame if somebody whose name was on a GDR list of doped athletes were to have dominated that era. And what reason have you to believe he could have dominated anyway? Certainly not the 1500m. He was destroyed by Ovett just a few days later at the same championships and trailed in 9th. He ran a great 800m race in Prague, but we know that Coe was suicidal in that race and Ovett was focused solely on Coe. In other words, he was a bit lucky that day.
I presume it was you who made the claim about Gonazelz winning at LA if he hadn't been injured because I've never come across any other person who thinks that. There is no evidence before or after LA that he was capable of that, apart from in 1987 when he rather suspiciously was able to run sub 50 second last laps in his 30s.
'Plenty of ifs and but'. I don't wish to be rude but yours is the dumbest post I've read here for a while. Coe and Ovett absolutely dominated at both 800 and 1500 between 79 and 81, Ovett had been dominating since 77. They smashed numerous world records, performing feats never seen before or since, such as Coe breaking 4 WRs in one season and (briefly) being the only ever athlete to hold the 800- mile world records, and both he and Ovett trading 3 Mile world records in 9 days (Ovett claims he would have got it back a couple of days later but the season was over, and he couldn't find a promotor to set up a race for him - but that's the only real if and but I've mentioned here).
Coe and Ovett were still in their physical peak and still improving (or at least Ovett was seriously chasing WRs by now) going into 82. It's not logical to think that they wouldn't have continued to chop at least a few tenths of a second off one or two of their WRs if they had remained healthy, especially if as planned they had raced each other a number of times in 82. There was nobody in 82 who really got close to their times, although Cram certainly was getting there and proved he was on their level as a competitor and ready to challenge them when they came back.
Are you really saying that Gonzalez being injured before LA was a greater 'what if?' than Ovett not crashing into railings at the end of 81, or Coe getting ill in 82 and 83?