Collect will just add the rows. AddColumns seems incapable of taking data from other tables. Update writes over the whole row. I read that Patch could do it but that I needed an anchor column so I went to the trouble of creating a Index for those two tables with this guide http://powerappsguide.com/blog/post/generating-row-numbers.
But Patch doensn't add them. I honestly don't know what to do.