I tested some more and found that Pool disks are picked UP. 

Head1: Cachedevice1 (c0t0d0)
Head2: Cachedevice2 (c0t0d0)
Pool: Shared, c1t<X>d<Y>

I created a pool on shared storage. 
Added the cache device on Head1. 
Switched the pool to Head2 (export + import). 
Created a pool on head1 containing just the cache device (c0t0d0). 
Exported the pool on Head1. 
Switched back the pool from head2 to head1 (export + import)
The disk c0t0d0 is picked up as cache device ... 

This practially means my exported pool was destroyed. 

In production this would been hell.

Am I missing something here ?
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