When purchasing Improved Spirit, the Vitality Stats table in the Mods menu includes the item and shows a +1 m/s boost, but this increase is not reflected in the total sprint speed.
Demonstration that sprint speed doesn't increase
I know this wouldn't happen in normal game because there can be only one Sinclair but this is funny
If you hex Sinclare and then use their ult you turn into glitchy bunny yourself indefinitely
If you hex someone else and then use their ult you're going to turn into bunny while ult is...
Killing with Mo & Krill's ult grants Sinclair permanent health, but the UI counter doesn't reflect the max health gained.
Additionally, Grey Talon ult kills don't grant spirit power.
Edit: Killing with Talon's ult actually gives you spirit power but doesn't show up in UI