Oh I see, I was confused, I was thinking you meant what the bids mean immediately after 1
♠ overcall, not on second round after negative double.
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GIB wouldn't start with double and later introduce 5+ of any suit. If that 5+ suit is the opening, cuebid of overcall will follow showing limit raise or better hand.
Hmm, I think GIB should allow to bid some hand like x KQxx xxx Kxxxx by double then support clubs.
1c-(1s)-x-(p);1nt-(p)-?:
2C: maybe ~7-9/10?
3C: ~10-12
2S: GF, and not necessarily club support.
Cue bid after negative double should = GF, not LR+. I think dbl with x AKQx Axxxx xxx after partner open 1c is fine. You want to hear partner support heart if opp raise spade, but partner won't introduce heart if you bid diamonds. And auction may prevent you from bidding 3H yourself.
It should also be able to introduce diamonds with a weaker hand with same type of shape, 4-5/4-6 in the reds.
What it should avoid doing is neg double holding 5+ suit and GF values, or 5+ H and ~10+.
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If the suit is another one, would just bid 2X and later will cuebid.
This works if you have GF. But it may not be best call with GF and 4 cd only hearts, it may be hard to find heart fit. And doesn't work if you are strong enough to neg dbl, but not strong enough to bid 2X.