OSplugin - Sky models and distribution

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Hello everyone, I did a Radiance simulation with OS plugin and I am interpreting the code generated:

Info: oconv materials\materials.rad model.rad skies\dc_sky.rad skies\dc_sky.rad > octrees\model_WG0.oct

Info: type numeric\merged_space.map | rcontrib -ab 10 -ad 65536 -as 512 -dj 1 -dp 1 -dt 0 -dc 1 -lw 1.52e-05 -I+ -fo -e MF:1 -f tregenza.cal -b tbin -bn Ntbins -faa -o output\dc\WG0.vmx -m skyglow octrees\model_WG0.oct

Info: gendaymtx -m 1 "wx\in.wea" > annual-sky.mtx

Info: dctimestep output\dc\WG0.vmx annual-sky.mtx | rmtxop -fa -c 47.4 120 11.6 - > output\ts\WG0.ill

Info: rmtxop -fa> output\ts\WG0.ill -t | getinfo - > output\merged_space.ill

I have some questions:

why does in oconv the dc_sky. rad is duplicated?

also, according to Mardaljevic (PhD thesis) this file (dc_sky.rad) is a description of a uniform sky but then later we use gendaymtx to produce annual sky models (Perez models), does this information conflict with one in dc_sky.rad? From my understanding Perez models produce sky conditions over the year (clear, overcast, etc).

if i want to add more sky patches in gendaymtx (-m 4) do I need to change rcontrib trengeza.cal?

Thank you in advance for your time.

Best regards