Sounds a bit odd to me.
Why would they need to operate the BN2 multi crew? It’s a single pilot aircraft and is flown as such by almost all operators. I’ve only had a brief introduction to the Islander, and apart from being very pleasant to fly, she certainly isn’t the most complex aircraft. I would imagine the FO would very quickly run out of things to do! Not to mention the cost implications of an airline operating a single pilot aircraft with two pilots just for the sake of it.