Rush makes it possible to sign him, definitely. In a sign-and-trade, however, if Iggy were signed at the first year value of a Jefferson trade exception, he would get about $47.6 over four years, which is close enough to 4/48 to be plausible. A Biedrins trade exception could actually help on negotiating with the lakers in case they want to dump MWP:
Lakers get:
Bogut
Barnes or Thompson
Ezeli
Pick
$7.7 mil exception for MWP
Warriors get:
Howard
MWP
This would leave Golden State with about $8 mil below the apron, which might be enough to brig back jack, and then fill the roster with min salaries.