First up, make sure he has the current codex as there are NO named ctan anymore and the current elite choice called the ctan shard is not unique. You are limited to how many and which powers a shard can have though.
As they are elites, so long as he follows the rules for picking the 2 powers per shard, you can field 3 as your 3 elites choices. At this point, shake his hand and congratulate him on giving you kill points and an easy game as your poison weapons destroy his shards
Objective Secured - Western Australia's Premier 40k Event Organisers and Website