If we weren't stuck in the Twilight Zone for the past few years I'd say Lealiifano was a shoe-in at 12 as we pretty clearly have two inside-centers playing what could be interpreted as test-quality rugby. But alas
If McCabe is selected at 12 for the Lions series then I agree with you, but if Tapuai plays 12 and Lealiifano misses out, I don't think that is a crazy or unfair selection.