Answer

Sorry, I can only provide information that is clearly established within Jain tradition.

Explanation

Jain tradition clearly teaches that Lord Mahāvīra was the 24th Tīrthankar of the present time-cycle and that he revitalized the Jain saṅgha by teaching the path of right faith, right knowledge, and right conduct.

However, questions like:

• “What would Jainism look like if Lord Mahāvīra had not appeared?”
• “Would Digambara monks look more like Śvetāmbara monks?”
• “Would they be yellow-clad?”

are hypothetical. Jain scriptures and accepted Jain tradition do not give a definite historical answer to such alternate-history possibilities.

Spiritual Understanding

From the Jain viewpoint, a Tīrthankar appears when the conditions of the time-cycle are suitable for re-establishing the fourfold saṅgha and teaching the path to liberation. Lord Mahāvīra’s appearance is therefore understood as part of the natural spiritual order of this avasarpiṇī kāl, not as an accidental event.

Takeaway

We can respectfully say that Lord Mahāvīra played a central role in preserving and organizing the Jain path for the present era, but Jain tradition does not establish what Jainism would have become without him.