独立主格中同时有倒装

201712月四级阅读中句子:Even men and schoolchildren are swelling the ranks, among them my friends three small grandsons. 其中的among them my friends three small grandsons属于名词+介词短语独立主格。但正常语序应该是my friends three small grandsons among them.这里后半部分并不是太长,为什么要用倒装。当改成完整句时my friends three small grandsons are among them会是一种常见倒装情形among them are my friends three small grandsons.是否这种完整形态的倒装习惯影响了独立主格形式的表达?这种独立主格中同时有倒装是纯属习惯?还是有语法意义(为了强调?或是简洁?)
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