The lack of "textshares" is the only thing that WikiHistory does that XTools does not. WikiHistory is very popular in the dewiki community and they are asking to get the same textshare data. This was part of a wish on the Technical Wishlist Survey.
Textshares can be described as a list of editors to an article, with percentages representing how much of the article they authored. This is broadly related to the "Added (bytes)" column of the "Top editors" section, but I think textshares might be more complicated. There is some older code to go off of.