In Jain Dharma, Tirthankars are the supreme spiritual ideals, and Nakoda Bhairav is generally understood as a lok-dev / protector deity, not as the supreme God.

So, from a Jain view:

• Worship of Tirthankar is for liberation, purity, and spiritual upliftment.
• Worship of Nakoda Bhairav is usually seen as prayer for protection, obstacles removal, or worldly help.
• If someone begins to treat him as the ultimate God instead of the Tirthankar, that is not the main Jain principle and can be a misunderstanding.

A balanced Jain understanding is:

• Bhakti may be offered to lok-devs
• but ultimate reverence belongs to the Arihants and Siddhas

So yes, your concern is valid if devotion shifts away from the true Jain ideal. In Jain Dharma, no protector deity should replace the place of Paramatma, Arihant, and Siddha.