Call Wit 3, then no cross of plaintiff. Yes, P can bring out the fact that D and WI are friends. This goes to bias. Although there is no rule for bias, it is always considered relevant and extrinsic evidence on bias is always allowed. P may bring out that WI has received the tickets because this could bias WI in D's favor.
Evidence regarding bias is always relevant and always admissible.
If W I denies receiving the tickets, P may offer them into evidence as extrinsic evidence of bias is always allowed. Evidence of habit is allowed under FRE 406. Sustained in part, overruled in part. D's attorney may object on competency grounds, FRE 601, though he is not likely to succeed. Competency is construed broadly and W5 will likely be able to testify.