Not sure if that's a relative bargain compared to this deal or if it makes the $15.7B look totally unrealistic. As of a few years ago the total revenue of the two firms wasn't that different.
Birst end up getting acquired too. https://www.infor.com/news/infor-to-acquire-birst-infor
This is true, because Thoma is a PE firm and is literally in the business of acquiring and selling companies.