Re: Difference btw randori and jiyu waza
At the risk of being taken to task for making general statements.
The key in Tomiki/Judo randori is the resistance or more specifically the loss of distinction between tori and uke.
Jiyu waza in Aikikai/Yoshinkan maintains this distinction and is considered the lowest level of randori training in Tomiki - we call it Kakari geiko
Randori in Aikikai can best be described as multi-person jiyuwaza. In Tomiki we call this Ni nin dori or San nin dori for two or three opponents, respectively.
These forms of jiyu waza can get quite rough and are a valuable training mechanism and I would say there is quite a bit of potential overlap in definitions.