Second test against the All Blacks last summer brew. A lot of the good work Heaslip and O'Brien do is enabled by Locky.
I did undersell him somewhat there by not explaining myself sufficiently.
He is an intelligent, gifted grafter who will provide a platform for more talented players to shine and he can do that up to a very high level, possibly even international level consistently (not proven yet). He would not be a bad call and there's a fair argument to be made for him - he's show what he can do with O'Brien and Heaslip a lot, including the NZ match. He will never be a standout player though - he will have standout performances, but he will never be at O'Brien's level. If you play him, his time will always be limited, as sooner or later a more exceptional player will take his place. But that is not necessarily a bad thing, and its true of a lot of the options. I don't think any reasonable rugby fan would complain if he played.