In scenario A, Jim holds a remote job at Omnicorp.
In scenario B1, nothing changes.
In scenario B2, Jim is transferred into a job with the same responsibilities that is not remote. This raises Jim's expenses by $2,500 a month. It also raises Omnicorp's revenue by $X per month. X is the value you forgot to consider. What is it?
If, for example, it is -$500, then the total cost of transferring Jim is $36,000 per year. If we split that difference evenly between Jim and Omnicorp, Jim will receive a $12,000 raise... but Omnicorp will suffer a net loss of $18,000 per year, so it's hard to see why this would happen or who it helps.
If it's +$1,000, then the total cost of transferring Jim is $18,000 per year. Splitting that difference evenly means Jim gets a $21,000 raise, but again there is no reason this would actually take place, because the company is paying $21,000 a year in order to receive $12,000. Or, viewed another way, the transfer destroys value and you shouldn't expect it to happen.
If X is +$3,000, then the total cost of transferring Jim is -$6,000 per year. At this point the transfer makes sense and it should happen. Splitting the difference evenly means Jim will get a $33,000 raise.
At no point does it make any sense to consider leaving Jim where he is and giving him a $15,000 raise.