To unify a sales team, it would help to include an explainer of what each Deal Stage is used for. By adding a description to the Deal Stage, each salesperson can be clear what the stage is used for.
For Example - If Deal Stage 2 is "Phone Needs Assessment" - I might want to hover over that Deal Stage Name and see the description in a pop up that says: "Carry out a needs analysis of the prospect's business to prepare for a demonstration. Understand the prospects needs to showcase the solutions that will build upon their needs."