If they search my house, they will find lots of pairs of gloves (and some toddler mittens too). So, the first question is whether the glove in question is connected to the kidnapper. Then, the next question is when was it found and has it been forensically examined. They may have found it right away on day one and just didn't announce it. Evidence is often (almost always) withheld from the public unless it helps the investigation. If it was just discovered, then why the delay? Why wasn't it found sooner? Was it really well concealed? OJ jokes aside, leaving a glove behind is really dumb.