I wouldn't say all the techniques seen in BJJ....not by quite a ways.
But certainly more than mainstream judo.
To stay on topic... I am yet to see a BJJ technique that I have not seen done by Mifune, or Kawaishi or in Kosen Judo. The techniques are nothing new to me. I would say there may be some slight difference, leading to variations etc.
Hence the reason I suggest judo to deal with BJJ. The standing techniques will also help your aikido, as will the fact that you get a resisting opponent.
(Remember we have to stay on topic