with Sinclair called in as cover for both Macca & Jake, then I'd say it's safe to say he'll lineup for the 2nd Test - I don't think either Papps nor Styris have shown enough to warrant selection..........
I think they'd be feeling a bit more comfortable re the prosepct of doing without Styris & / or Oram now that Cairns & Vettori have shown some form with the ball...........
the question will be will Big Jake be able to take the field as a speicalist bat??? if not then we may see both Mills & Hopkins join Sinclair in the playing IX........
Richardson, Fleming, Astle, Sinclair, McCullum, Cairns, Vettori, Hopkins, Tuffey, Mills, Martin???????
with Astle, Sinclair, McCullum to be interchangeable re order, as all have experience as openers in ODIs, & Sinclair & McCullum have opened in the longer game at domestic level (Sinclair for NZL 'A')..............
Sinclair at #3, McCullum at #4 & Astle at #5 would be my pick - Sinclair to anchor the top of the innings, McCullum to provide some impetus if required (& utilising their experience at the top of the order), and Astle's nous to work with the all rounders & lower order / tail................