well, I wouldn't say that LI is unbetable by perimeter offence and/or 2-3 defence... check out my last seasons decisive games in Latvian cup. both times win over LI by playing "Princeton" ;)
simply you have to have sutable team/players to play 2-3 zone. and not against all tams playing LI that zone will be effective...
final
(38996754)1/2 final
(38984187) against team that dominated the cup for previous 2 seasons...