Agreed. Haven't given much thought to the V, but you're right, in the event of you losing the coin flip and being forced to go second that is a good option to have.
When you go second with Shadow Rider you want to attack with Cresselia to accelerate to the bench to enable Shadow Rider Vmax to reach ohko levels faster with Max Geist. Going second and leading with Cresselia will leave you wih four energies attached at the end of your turn. If you can evolve two Shadow Rider V into Shadow Rider Vmax you can have a total of seven energies on the battlefield on your send turn which boils down to 220 damage. That should be sufficient to knock out most Pokémon V.