I've already explained to you (giving examples) that it is not possible to accurately tell the # weight of a rod by the style of handle it has. For instance, I have 9' to 9' 6" fly rods ranging from #5 to #8 with reverse half wells handles in my possession; so that's 4 different # weights there. I also have a couple of #5 weight 8' 6" rods with full wells handles. Cigar shaped handles have been typically used on rods varying in length from 6' (and shorter) to around 8', ranging in # weight from #1 to around #4 - once again, that's a range of four different weights.Yes I know it's not a hard-and-fast rule - the word used was 'likely' - but It's generally the case that a #5 will be half wells and a #7 will be full wells. #6 is more ambiguous. We have to start somewhere.
There's simply too large a margin of error for handle shape alone to be used as an indication of likely # rating, and this is fact, not generalised supposition.