offseason there will be more bf. physique is different because those guys go for a different look then traditional bodybuilding. i think physique guys aren't always concerned with bulking during the "off season" if they are already big enough to do well in comps. when contest prep happens of course they will be in a caloric deficit probably adding in compounds like winstrol, anavar, or masteron. probably using clen or albut when they hit a plateau losing fat. its hard to say on amount of these drugs or what they cruise at because genetically everyone reacts to aas differently. one guy might be able to do awesome with just 600mg/week of test then another guy might have to through in tren to get the same gains. its hard to put all people into one category of what they take. as for putting on lean mass at 5%bf you can if your ok with your body fat going up to 7-8% if you start bulking at like a 250 calorie surplus when at 5%bf you will gain lean muscle but also fat. but at 7% you are still going to be shredded. yet again its hard when talking about physique because i think once those guys reach a certain size a lot of what they want is definition and maintenance not necessarily more size. so they might not be looking to bulk very often if at all.