I just don't see why Everton don't march up to the front desk of Palace FC and on a pallet (which has been transported via pump truck) all wrapped up nice and tight for them is Delph, Walcott, Sandro, Pennington, Besic & Tosuns right leg + 1.5m upfront with 2m in add ons based on how many CL's we win and say "that's yer lot now give uz Zaha now"
Everyone's happy, everyone's a winner.
Deals are only made complex because the people who are doing them are stupid. Do it my way like above and it'd be done in 10 minutes.