Partnered Self Funded Search - How to Split Equity Unequally?

Looking for general advice on how partnered searchers split equity in atypical situations. Keeping this particular scenario at a high level...

Purchase Price = $5M
Equity = $2.5M
Debt = $2.5M

"Searcher A" brings 100% of the $2.5M in personal capital (yes, purposely not fully levering). "Searcher B" provides zero capital but has related operating experience in the target company. Both searchers plan to work in the business. And assume both searchers will have to personally guarantee the debt since they'll be above the ownership percentage threshold.

Any advice or guidelines on how to fairly split the ownership?