You are over complicating things ??
take a look at index.php in the defualt theme. Im going to cut out the normal post display stuff for simplicities sake and because the normally used pastebin.com appears to be broke.
We have the normal stuff at the top:
<?php get_header(); ?>
<div id="content" class="narrowcolumn">
<?php if (have_posts()) : ?>
<?php while (have_posts()) : the_post(); ?>
After that, we are in the loop. So lets count the posts returned, and then do something with them.
<?php $numposts = (count($posts)); ?>
<?php if ($numposts == 1 ) :?>
<– One post returned.
This is the point at which you decide what you want to show using all the normal template tags. Stuff like this:
<div class="onepost" id="post-<?php the_ID(); ?>">
and so on …
then we put in the else statement :
<?php else : ?>
Here, we tell WP what to do if more than one post was returned. This would be where you would do alternate styling.
ie,
<div class="morethanonepost" id="post-<?php the_ID(); ?>">
after that, we close the if statement that we added:
<?php endif; ?>
and the rest is back to the normal stuff within index.php that closes the loop, adds the navigation, sidebar, footer, etc..
<?php endwhile; ?>
<div class="navigation">
<div class="alignleft"><?php next_posts_link('« Previous Entries') ?></div>
<div class="alignright"><?php previous_posts_link('Next Entries »') ?></div>
</div>
<?php else : ?>
<h2 class="center">Not Found</h2>
<p class="center">Sorry, but you are looking for something that isn't here.
<?php include (TEMPLATEPATH . "/searchform.php"); ?>
<?php endif; ?>
</div>
<?php get_sidebar(); ?>
<?php get_footer(); ?>
does that help?