I don't agree. SML will beat Mondo over 400 but it will be epic. SML 47-high to 48-low, Mondo 48-high at best.
Top short sprinters - and I agree Mondo is seriously fast out of the blocks but he's not even a 200m guy - rarely extend beyond 200 unless that's their regime. Linford Christie and Carl Lewis for instance, both at low-47 for 400 despite their 9.8s for 100 and 19.7/20.0 for 200. Mondo has zero conversion and will struggle for 21-low at 200 with a total collapse after that.
Sadly I doubt SML has the sense of fun needed to go for it vs. Mondo. Despite her trash talk last year SAFP bottled out when it became evident Mondo would smoke her.
Maybe the DL organizers could make Syd's DL Final participation contingent on victory over Mondo in their 400m duel the preceding day.