They may have noticed the flaw and thought it was insignificant, which it might have been, until the taint came along. This sort of thinking can be applied to most modern technologies.


It's all assumption, no one knows what's going to happen. Cadsuane also says it lacks a buffer that makes other sa'angreal safe to use. Callandor is the only sa'angreal or angreal that actually magnifies an effect of the taint. Even drawing through the CK keeps the taint proportional and doesn't magnify it. Its possible the flaw is the lack of a buffer that protects the mind, and opens it to other potential sources of energy.


Callandor may be a special case due to the flaw. The flaw has a point and I doubt its redundant now that the taint is gone. The 'three becomes one' is a reasonable theory that the three powers unite to form a new seal. Lews Therin said that something has to touch the DO, and we know that if saidar had been used in the first Strike, it would have been tainted too. The TP is a reasonable alternative that cannot be backblasted by the DO while Rand uses the other two to form a seal.


Its mysterious because the crystal sword clearly has a role to play at the LB, and not the CK or any other sa'angreal. Its a big mystery to Min and Cadsuane certainly.



Its more than likely that his link to the TP is through Moridin. The DO may be caught by the decision to cut off the Nae'blis from the TP leaving him ultimately defenseless, or the chance that Rand could draw on it again.