If he signs Brunner then Lou has to consider what he'll give Josefson and Henrique. If Brunner gets like 3 mil then Josefson and Henrique should get more. It would be absurd to give Brunner like 3 mil per season and give known commodities like Henriqque and Josefson less.
UFA vs RFA. They're completely different cases with no relevance to each other.