In my humble opinion, unless the Josephs return and begin to click again along with Seales, and the top order continues to show the immense fragility, only then will I, note, consider Justin Greaves being shifted up above where he currently bats. Otherwise I think he's the perfect foil where he currently bats to bridge the top and lower order.
The hope is, now that Shai is producing, Campbell and another will start pulling some weight. Roston for example I am not asking a whole lot from. The odd 40s, 50s and 60s and the occasional conversion. But for him most of all to spend time at the crease for each innings to stabiize the middle.