Agree, it's too late to be effective. What's the point of a Greyhound at the same time as a Stuart or Flak HT?
You could say it's an AI specialist and could pair well with a Stuart, but the canister ability is severely underpowered, so along with needing an MG upgrade it's a munitions sink just to get any AI power out of it (probably it's like this because CoH1's Stuart cannister shot was so massively OP ).
The cannister shot, when the unit got released, was the wipe maschine 9000. Click and destroy. Prepare your anus. There is a reason why it got toned down.