No, the coelocanth was not any sort of embarassment for evolution.
The coelocanth is a member of a group (the lobe finned fishes) from which land animals are descended. Anyone with any understanding of evolutionary theory would know that that does not in any way imply that the group overall should be extinct or have left the sea. This is juat a variant of the silly argument "if humans came form apes, why are there still apes ?" argument and is just as nonesensical.
There was no expectation that the coelocanth would "walk" (it still has the fins from which legs evolved). And the coelocanth was found in deep sea regions so there is abolutely no reason to expect that it would find any advantage in adaptions to enable it to move on land!
Nor is there any embarassment to evolutionary theory in the fact that the coelocanth is "still a fish" (and contrary to common creationist belief the modern coelocanth is quite distinct from ancient forms).
So there is no "loss" here for our sid e- but in using sch a hopelessly wrong argument you have scored an own goal. I hope you will have no trouble admitting that.