That's how I originally read it, but Tiny was 22 feet tall. Hard to imagine a creature that enormous shouldering its way into Mac's. I imagined the Gruff in Mac's to be closer to 12 feet.
Harry starts calling him Tiny at Mac's, that's also what he calls the Gruff at the train station... ergo same Gruff. At least for me.
Also, why would they send a new Brother after the incident at Mac's, the one that was there hadn't failed yet.
Also Harry told him: he (the Gruff) would only loose a little time, and that he'd find him (Harry) again soon enough.
That's serious foreshadowing for the fight at the station.
Tiny the Gruff at Mac's = Tiny the Gruff at the station
That's my take.
The Uzi-Gruffs are described as being considerably taller and faster than the Snowball-Gruffs... wich makes them slightly older brothers to me.
1. Snowball-Gruffs (youngest)
2. Uzi-Gruffs (younger)
3. Tiny the Gruff (older)
4. Eldest Brother Gruff (eldest)
Those are the Gruff-Levels I see
I honestly did not think that my wise-ass remark would spark that much of a discussion... but what did I expect around here... guess I should have known better.