Someone earlier said something to the effect of 'he doesn't need more mixup opportunity, he needs improvements to his current gameplan to function more effectively w/in that construct' (definitely paraphrased). While I am inclined to agree w/ that notion, Tackle as a blockable overhead hit-grab sure would be neato.
That said, I have to note that Cyborgs Tackle is not reactable. Correct me if I'm wrong, but it starts up in something like 14 frames? That is right at the edge of fastest-ever human reaction. Nobody is reacting to Tackle unless it whiffs.