The biggest issue is the on-demand Unstoppable from Johanna so if she engages into the ETC he is mostly worthless since he won't be able to Q or W or R her. But if he gets the engage into her then that is a different story since she can't D while stunned. But the left team has a Lili which will be very difficult at best to contest. Johanna is the only form of way to cancel Lili's jugs and it will mostly have to be done off her R. But there is so much front line between Butcher, ETC, Zeratul that it will be difficult for her to reliably get her R to hit Lili. So if ETC can engage into Johanna and unload some damage into her at the onset forcing her to disengage (hence putting Lili completely out of W range and most likely out of R range) it will be nearly impossible to stop her R. There is also very little hard CC on the Red team to would require a cleanse so Lili in this situation maybe a better pickup than Malf.
No lets move onto the ETC. Both Butcher and Zeratul will absolutely love getting additional attack speed increase from ETC. Is he the absolute strongest tank in the world? No. But he is a very helpful tank especially against heroes that benefit well from attack speed increases. So in an absolute perfect world what ETC would like to do is Q into the middle of the team, W someone away. The Butcher should then E onto the most segmented or highest priority target. Zeratul will R the backline which got pushed even further back by ETC's W. You jump on the segmented team and turn every team fight into, at worst, a 4v5.
Now could a random assortment of HL scrubs pull off this theory? Probably not. But the team is fundamentally sound.