NEL methods often harness the semantic similarity between mentions and entities and also among candidate entities for different mentions (in Wikipedia or other KBs) for contextualization and coherence disambiguation (Hoffart et al., 2011;Milne & Witten, 2008;Kulkarni et al., 2009;Ratinov et al., 2011).
in the absence of CR mention groups, NEL has limited context and is bound to miss out on certain kinds of difficult cases.