Re: aikido vs jiu-jitsu
*it's either a game (with judges and prizes) or it's Budo (of life and death matter)."
....or it can be both
Aikido is a way of aiki... It specializes in teaching aiki
Yes, takedowns etc are involved, but aikido is not focused or specialized on tactics so much.
Also most judo typically is not "even" on takedowns and ground and judo focuses on throws vice takedowns...although of course, YMMV.