Tony, unless I'm misunderstanding your argument seems to be that SISU could have, and should have, made the exact same deal Wasps made.
There appears to be no evidence at all to support your assumption. CCC could easily have said the same terms were available to SISU but were rejected by them, the fact that they haven't said anything remotely like that suggests to me its not the case.
In fact while there is no evidence to support your assumption there is evidence to suggest the opposite is true, that in fact for reasons unknown CCC were resistant to CCFC gaining ownership of ACL. Think back to when SISU first arrived. At the time there were other interested parties, all those other parties required ground ownership as part of any takeover, they all walked away after meeting with CCC as there was no deal to be done. In fact we have CCC to thank for ending up with SISU as owners as they were the only ones prepared to buy us without owning the ground.
Look at the comments of Mutton and Lucas as leaders of CCC, both have stated there would be no sale to CCFC. Mutton was particularly critical of the club and its owners. Many hoped that when he lost the leadership things might improve but at that point he was moved on to a committee to oversee the Ricoh.
And of course there's the outright deception around the return of the club and the sale to Wasps. Within a matter of days it had gone from the club coming back and hopes for a better relationship leading to the club taking at least part ownership of the ground to ACL being sold to Wasps.
Don't confuse confidentiality with exclusivity. There was absolutely nothing preventing CCC informing SISU an offer had been made and asking them to match or better it. In fact that would be the sensible thing to do if you want to maximise your return. The ideal situation for the charity and the local taxpayer would have been a bidding war between SISU and Wasps for ownership of the Ricoh.