Ultimately, I’d take Ovechkin at his best (2006-2010) over Bourque at his best (1987-1991). Beyond those respective windows, I do think Bourque makes up the ground.
Outside of 1987-1991, Bourque has an additional 9x 1st Team, 5x 2nd Team to what I would assess is Ovechkin having the equivalent of 5x 1st Team, 2x 2nd Team. Certainly not insurmountable that as he gets older, Ovechkin can match this. But I also don’t think he has to anyway, because like I said, his 2006-2010 is better than Bourque’s 1987-1991.
I think the most interesting thing to consider here is that defensemen age better, at least going off the awards they tend to get in their post-30 years. Maybe part of that is that Norris and defensemen All-star votes are based on reputation more than hard numbers; it is also true that the skill set defensemen need is not that age-dependent. But in any case it seems that in this sort of "All-star" comparison forwards are shortchanged just because they are forwards.
Take Jagr and Lidstrom as an example: Lidstrom has 10x 1st All-star team, 2x 2nd All-star team; Jagr, as a winger, has 7x 1st All-star team, 1x 2nd All-star team, and I do not think he ever came 3rd or 4th in voting, so it is likely that if we scramble for additional seasons when Jagr was better than 4th-best defenseman, we will come back with nothing. When would that be - 1993/94? 2001/02? 2006/07?
I think you said on the previous page that you think Sakic was better than Lidstrom - can you find 10 seasons when Sakic was better than the best defenseman in the league? Even if we dig deep and take all the years when Sakic finished top4 in All-star voting as a C, we have 9 such seasons (and no, it is not about Sakic losing to Lemieux and Gretzky: he finished behind Zhamnov, Modano, Oates, Francis in different years).
And then Chelios sticks around forever and gets on 1st All-star team as a 40-year-old (and as a 33-year-old, and as a 34-year-old).
So it seems like counting All-star team appearances overvalues defensemen as compared to forwards, and probably by a lot.
There are smaller points to make as well: for example, "9 1st All-star teams outside of the peak years" sounds like overselling Bourque, because in two years early on Norris voters dissented and once did not even nominate him. Also, Ovechkin's off-peak 2014/15 and probably 2012/13 can well be better than any of those off-peak all-star team finishes by Bourque.