Player rating for tournaments across all installments of Heroes.

A purely game-based rating includes an element of aging. But how do you account for aging if not everyone will play all versions? That's why it's necessary to somehow combine this rating with Grails. I would like to hear your opinions on my idea with different "currencies" to make it easier to convert everything into Grails later?
Some changes suggested by Alan have been made to the first post.

In the system I proposed, the leader in any tournament receives 50 points. The rating for the rest is calculated based on how close their result is to the leader's, day by day, on a given map. Therefore, combining this rating for tournaments with 1, 2, 3, 4, or 5 heroes is not a problem. The issue is aging. An alternative: if a player has played at least one of the rated tournaments within a month, then aging is not applied to them in other versions. And if this rating is also common, then there are no problems at all. In the summary rating table, they have what they have. So stop creating multiple currencies, you counterfeiters :)