GATK 4 spark tools vs non-spark tools

Hi,

I just started experimenting with GATK 4. In particular running through the spark tools (LOCAL). Am I missing something or is it not possible to go from spark tools for pre-processing (BwaAndMarkDuplicatesPipelineSpark + BQSRPipelineSpark) to the non-spark haplotype caller without sorting the bam file out of band b/c spark tools don't create a sorted bam file?

Thanks,
Wolfgang