This all sounds like GREAT ADVICE mine was left outside in a 3 or 4 day rain storm while i was in the hospital with my daughter getting a new grandbaby.Not really thinking much about it until things settled down about a week later.The cauldex was soft very soft almost mushy and shrinking to the point of being wrinkled.
I am sure the great people on this forum remember because they helped me save this poor plant.I now have mine planted in a chuncky mix and when i water it the water does seem to run straight through but it has some bark in it that holds water.I live in Ga. so it dries out completely in about 2-3 days.When i re-potted my DR had already lost all sucker roots (feeder roots).
I think you can never be to careful but take a few extra steps to make sure it drains very well,I monitor the amount of rain & the amount of sun between storms,humidity i have found the higher the humidity the longer it takes soil to dry.
I let mine stay out for 1 day or 1 night of rain,depending on the last time i watered. That's only my opinion and i am fairly new at growing Adenium's,
but i've learned a lot in a short period of time from the great folks at ATP.
I must try to post a picture because even this late in the season my DR has blooms and for everyone who helped me this picture says it all.
I hope i can find a good picture.