I think North has plenty for a free 1s response. 6 working hcp, two doubletons, 5 cd suit, why silent? I'd bid 1s on anything resembling 7 total points, change QS to JS and I'd still bid Get the fit in while it's cheap!
I feel like GIB requires too much to bid at the 1 level, whereas it bids quite freely on bad flat 6 counts at the 3 level after the opps raise a major after partner's takeout double. This is backwards. The free 3 bids are described as "6-10" total points, they should probably be more like 8-11?