Tenshin Shinyo-ryu is still extant. If you get a videotape, you will see that there is little relationship between TSR and aikido, yoshinkan or otherwise. Different body mechanics altogether - even if Ueshiba had learned more than a sickly youth's three month's worth.
Tenjin Shinyo Ryu is not extant, http://www.tenyokai.com
I attended the summer Gasshuku a week ago. Having practised Aikido for 15 years you can see where Ueshiba Sensei took a lot from it. It is said that Ueshiba studied for over 10 years. With regards to different body mechanics, this is also not true.