Well, it matters since Solomon is not allowed to issue new shares according to its contract with ECAB. If those collateral shares would not be bought back, then the company breached the terms with ECAB, I wonder how ECAB would react then.
If the people that loaned the money sold collateral shares then in essence they have been paid and remaining loan amount should be adjusted to show compensation.
This is pure speculation, there is absolutely no facts supporting something like this.