Distinction between an insurer who is a noticee with one impleaded as a respondent in the claim petition

In Sheela O.K. Vs. New India Insurance Company, the Hon'ble Kerala High Court decided that When an insurer is impleaded as a party-respondent to the claim petition, as contrasted from merely being a noticee under Section 149(2) of the Act, its rights are significantly different. If the insurer is only a noticee, it can only raise such of those grounds as are permissible in law under Section 149(2). But if he is a party-respondent, it can raise, not only those grounds which are available under Section 149(2), but also all other grounds that are available to a person against whom a claim is made. If the insurer is already a respondent, having been impleaded as a party-respondent, it need not seek the permission of the Tribunal under Section 170 of the Act to raise grounds other than those mentioned in Section 149(2) of the Act.