What to ask, and why

Will removing mold make the rest of my house worse?
Not when the area is contained and kept under negative air with HEPA filtration. Ask to see the containment plan before work begins.
Do I need to replace all my crawlspace insulation?
Wet or contaminated insulation is usually removed; dry, unaffected insulation elsewhere can stay. Ask for a map of what's being removed.
Will the musty smell come back?
If the crawlspace stays damp, yes. Ask what moisture correction is recommended, such as a vapor barrier or drainage, and who does it.
Is mold remediation licensed in Colorado?
Colorado doesn't license mold remediators, so ask about training, containment practices, and documentation. IICRC certification is one standard worth asking about.
Can the water damage be repaired by the same company?
Sometimes. Ask whether the leak cleanup, mold work, and rebuild stay with one project manager or are split among contractors, and who you contact at each stage.