Ah, ok... I guess we'll have to agree to disagree.
In my (admittedly limited jujitsu) experience, a jujitsu lock closes the joints and works by isolating the range of movement in a joint (hence pain compliance) - and is usually achieved thru mechanical connection, independent of taking uke's center in the way aiki does.
Aiki, OTOH, is finding the path to uke's center, mostly indirectly, and seldom thru mechanical connections through closed joints.
Which is why nikyo and sankyo are very different in the way the jujitsu folk I play with apply it and how the aikido folk I play with apply it. YMMV of course.