The Gemoro often asks about an argument amongst Amoraim, “לימא כתנאי" Shall we say this is an argument of Tannaim?
I see two ways of understanding this statement:
1] These Amoraim are arguing on the same principle as the Tannaim argued and so there is only one disagreement and not two. (This does not 'criticise' the Amoraim.)
2] If the Tannaim already argued about this case, how can or why are the Amoraim arguing on the same principle – the Tannaim already discussed this. (This does 'criticise' the Amoraim.)
What is the implication of the question “לימא כתנאי"