Who to r4?

FlashSpidey

I'm so lucky! Just opened a 5* shard crystL and pulled Sentinel dupe! I have 10 sig stones I can put into him. Should I? Also, how does his dupe change him?

Samuel030s

Thier Signature Ability allows him to gain 20 Analysis Charges when the opponent activates a Special Attack that matches the previous Special Attack, such as if the opponent used two S1's in succession. It also reduces the effectiveness of abilities that cause Sentinel to lose power by a certain percentage.
Having a high sig level helps, but it isn't necessary, your Stones would probably be better off used on a different Tech Champion.
They should be quite useful in V2 and V3.