Quick Answer: Use a multi-touch attribution model that separates pipeline creation from deal acceleration, rather than forcing both outcomes into a single crediting rule. In practice, combine position-based or W-shaped attribution for creation with velocity-based or time-decay attribution for acceleration so you can see which campaigns generate new opportunities and which ones shorten sales cycles.
When a campaign influences both pipeline creation and deal acceleration, a single attribution model usually distorts decision-making because it blends two different business effects: originating demand and increasing conversion velocity. The most defensible approach is to track each outcome independently, using an opportunity-creation model for sourced pipeline and a progression or time-sensitive model for acceleration. This lets you measure whether the campaign is pulling new accounts into the funnel, improving stage-to-stage conversion, or simply moving existing deals faster toward close, which is essential for accurate budget allocation and optimization.