Laundry list
That list is just a who is who in the industry
No way Cisco buys PAN, what for? Same with Nutanix. Nimble is a maybe, Pure is too expensive. NetApp as well, they are legacy.
Splunk? maybe, but they just bought AppDynamics (I know, different space). RedHat? For what?
ServiceNow is a possibility, it works really well with CliQr.
I can see Cisco buying Veeam though