yup I think most of yriels initial fleet left with him as it states "he lead his followers into exile as a corsair prince"
Being forced to take a mix would be cool,I do not see how even 1:1 is broken. For each good ship you take you will have to take a worse one , so subsequently you will no longer have the all strong cruisers lists of CWE or evil escort spam of CE , but a mixture of CE and CWE cruisers and likewise you will have as many Failhunters as CE escorts , which IMO balances well enough.
just the 'normal' reserves' rules are awful for representing pirate prince lead fleets , it's impossible to capture the correct 'flavour'....
Ideally what I would like to see is something like this : buy prince, choose parent fleet, buy flagship, this can be any ship from either list (which should allow for the stalker in a CWE list) possibly buy some stupidly overpriced re-rolls (this is a good mechanic to represent the difficulties of trying to co-ordinate a mixed force) pick fleet as normal from parent list upto 2/3rds of points max (usual restrictions apply) , you may then spend upto 1/3rd of your set points limit on the other fleet list (usual restrictions apply) so 2 wraithships for 1 dragonship etc etc