Pakistan is a federation. Each federating unit (province) has its own government and can sign its own agreements, to the extent allowed by the federal government (18th amendment was the latest rule in the book)
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ALL CMs (or their representatives) were given opportunity to go to China and if they could convince some Chinese investor to invest in their province, Pakistan and Chinese government would help them sign agreements.
These are in ADDITION to Federal Government's own initiative for projects anywhere in the country. Federal Government's own plans are rather limited, to specific corridor projects. Provincials projects are a "side benefit" projects, that are not part of the "corridor" *per se* but more of "making hay while the sun shines".
Look at the Federal level even, all those power plants all over the country and what not, that doesn't have anything to do with the "corridor". Corridor is only the three routes, fibre, rail, pipelines, Gwadar Airport and Seaport. But since China is investing, federal government said, why not invest here too? Provincial governments offered opportunities too, in a similar vein.
So there are CPEC agreements both at Federal level (which Ahsan Iqbal deals with, as federal minister) and at provincial levels (which is not his headache, the province signed it can manage it, he is not their provincial minister)
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Like it or not, SS did his homework, and got the most projects. So he convinced the most investors. He managed to convince them for Metro Train for example. Punjab is a very good investment opportunity, because SS has invested in Infrastructure, and he personally gives danda to bureaucracy, so investors feel more confident.
CM Sindh also went, but he is an idiot. He barely managed to sell any opportunities. I think he managed to get some some wind-farm projects? Let me check, I forget the specifics.
CM Baluchistan also went. I don't think he managed to sell any opportunities on his own, mostly due to security and weak economic situations, so I think most projects there are Federal government's own initiatives.
CM KPK... he was dancing in Dharna at that time. He was specifically asked but he refused to go. He didn't do ANYTHING. Maybe because he thought he would topple PMLN government and then a federal PTI government will do it.
Now he complains.
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I have been following CPEC for a long time, (come join us on
SSC) it's not a big conspiracy.