Bhagavad Gita

ಭವಾನ್ ಭೀಷ್ಮಶ್ಚ ಕರ್ಣಶ್ಚ ಕೃಪಶ್ಚ ಸಮಿತಿಂಜಯಃ ।
ಅಶ್ವತ್ಥಾಮಾ ವಿಕರ್ಣಶ್ಚ ಸೌಮದತ್ತಿಸ್ತಥೈವ ಚ ॥೮॥
bhavān bhīṣmaśca karṇaśca kṛpaśca samitiṃjayaḥ |
aśvatthāmā vikarṇaśca saumadattistathaiva ca ||8||

Sloka 1:08
Gist of the sloka:
Worshipful you, Bheeshma and Karna; also Krupa who are winners; Ashwathamma and Vikarna; also, Somadatta and Bhurishrava.
For a person who could recognize many of the Pandavas, Duryodhana fails to recognize those warriors who are on his side. Fear makes us do strange things including forgetfulness. Let us look at why he mentions those names.
Worshipful you is addressed to Dronacharya. Dronacharya was the teacher for both the armies, along with various other warriors and Duryodhana in a way doubted Dronacharya alignment with him.
Bheeshmacharya had blessed Yudhishthira the eldest of the Pandavas; before the start of the war as - “May you win the war”. He was known to pray to Lord every day for victory of Pandavas. Duryodhana was therefore suspicious of his own Great grand uncle Bheeshmacharya.
Karna had vowed not to fight under Bheeshmacharya. Duryodhana who had sworn his friendship with Karna and had entered into the war based on Karna’s capabilities was now in midst of the same war without Karna fighting. It was like his main support being taken away.
Krupa was primarily Vedic scholar and had entered into the battle due his obligations of staying under the sponsorship of the Emperor.
Ashwatthama, son of Dronacharya was friend of Duryodhana but was known widely for his fickle mindedness. Though very capable was not dependable during the times of crisis.
Vikarna was one among the 99 younger brothers Duryodhana. He never mentions his capable 98 other brothers but picks on Vikarna who had tried to take advantage of situation during Draupadi de robing and tried to act as a virtuous person. Duryodhana therefore remembered him as a person who tried to take advantage of him, during crisis.
Somadatta was son of Bhurishrava. Bhurishrava was son of Bheeshma father’s [Shantanu] brother’s son. His presence was only due to the relationship and nothing more. Lacking any strong personal commitment, unlike other warriors.
It is very clear from the above that Duryodhana in his state of mind filled with fears and suspicion only recognized 7 warriors in his side consisting of 11 Akshohinis. Secondly, he mentions only those, against whom he had suspicion.
His lack of confidence, suspiciousness, belief that his enemies were stronger is very clearly indicated.