Duryodhana is implying that allthough his army is mighty it is insufficient due to the fact that Bhishmadeva being affectionate to the Pandavas as well as the Kauravas is not totally committed to victory for him; but Bhima being completely committed to the defeat of the Kauravas makes the victory of the Pandavas stronger and more likely to be successful.

Madhvacarya has no commentary so we present Baladeva Vidyabhusana's.

Now the question arises that if the armies on both sides were equal in might, how is it possible that victory is assured? Duryodhana gives the answer in this verse by using the word aparyantam in the sense of being unlimited. Duryodhana to conceal his fear exclaims that his army is unlimited and moreover they are protected by Bhishma who is the most intelligent and a maha-ratha; whereas the Pandava army protected by Bhima of less intelligence is limited. This is why the Kaurava victory is assured.

So it may also be put forth that if Duryodhana is so convinced of his superiority then why does he need to assure himself. In this verse although he states his army is unlimited by its tone it implies by his reply that the army of his with all the mighty heroes previously mentioned protected by Bhishma seems inadequate, whereas the army of the Pandavas which is protected by Bhima seems adequate to him.