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2♣-2♦
2♥-3♥
4♥
2♥ shows 5+H, 19+ HCP, 23+ TP
3♥ shows 3+H, 5+ TP (stronger than a jump to 4♥ would've been)
4♥ limits GIB's hand to 23-26 TP
GIB's hand was this:
The hand could've easily been a disaster if I really had 3 hearts and, say, some spade length. Note that GIB's positive response to 2♣ require some suit quality (6+ using the 8421 point count).
It's a difficult hand in standard, no doubt, but I don't feel GIB made the best choice among the alternatives. If it doesn't want to rebid 2NT with a small singleton, it could treat the spade suit as five cards so it could later show 5-4 in the majors, or open 1♦ and pray it won't get passed out.
For completeness' sake, my hand was
So it wasn't really difficult to bid the grand, but GIB got lucky. Another day my majors would be reversed and we'd end up in a silly contract.